Doorf said:
Sure PC is allowed to store 50000gp in gems and gold in let's say temple of Pelor but it is not save.
1 Becouse Dangeon Delver from Song and Silence can 'sense' treasures of 10000gp or 1000gp+.
2 Becouse suddently there might happen some war or clerics were obligated to prepare to war and might happen to use all the gold they could get to help/protect the innocent. If PC stored gold in temple then he is a member of this temple and then he must agree/allow his treasure to be used as temple decides.
(PC: I gave you ring with three wishes ! Two are missing... Priest: But we had plagues of rats sir, otherwise our worshipers would starve to death)
3. Why would temple risk to be attacked by PC's enemies.
4. If some mage/thief with scrolls arrives with teleport then casts mordenkajnen's disjunction to remove any magical protections and casts mass teleport on treasure there is no refunds to PC
5. Treasure needs place, protections, guards it all costs why would any temple do it for free. I don't believe in Santa Clause 
6. PC should buy house/keep/castle and mind his own bussiness rather then beg ppl to guard his gold, there are more important stuff for NPCs.
7. No such place as safe place exists.
8. Sure you can dig your gold somewhere ... worse if you was observed by scrying or someone is passing by with locate object cast on gold piece
9. Let's say hmm Middle ages. Would you believe that rich ppl that managed to earn a lot of cash on wars, killing others would every take their treasure and store it in Christian church for safe keeping? Buy buy gold. In middle ages all 'stored' jawelery would be considered donated
About Leadership i think it is great feat nice field for roleplay. Remember if you allow 1 pc to get it and you allow him to get his cohort with you other might want to get it as well. If you have 6 PC each with cohort you get 12 characters combats takes 3-4h each.
You can use your cohort and NPC for stuff like geather information, helping to build keep, persuading someone to do something,protecting your treasure, use scry on you to watch you and teleport in rare exceptions to help you.
Even i would allow scribing scrolls, making potions,analyze deomer, planar binding etc. and sharing spells from spellbook.
But big NO for traveling all the time with PC and helping him in every combat, if sometimes for some extremaly rare reason cohort/npcs is in combat they get full share of exp.
About travel: plane shift, mass teleport,or chained reach teleport (8th level cast by incanatrix), gate, windwalk is still on and very usefull.
About gate spell it is extremaly abusive to plane shift and gate in elminster, order him to sleep for 1r/level meanwhile you kill/rob him, no save no SR.
About GhostForm. You can cast wall of force at anyone if he can't teleport you can enter wall of force (half sphere) through ground 5' cast 2 spells and move back. Sure enemy can ready an attack but you can arrive with mirror images and half concealment from ghost form.
Persistant fiend form gives you ability to teleport w/o error at will for 24h. In haste you can teleport in cast 2 spells and teleport out.
About 13th level spell. There is no limitation about 9th level spells there is no limitation in buying any item according to core rules book. Sure you can limit it since you are DM but if you do you are house ruling, not playing exactly by book.
I never heard about ppl happy playing exactly by book without changing anything. We tried hard for about 18 months then gave up.
I em wondering if anyone made some similar set of rules not to rule 0 every time something odd happens.
I heard that Grayhavk licenced rules or osmething you can get paying 20$ to WothC don't allow magical items creation as well.
Btw 1 year ago before ELH appeard you could eazily create +50 bluff ring for 12500gp + some exp. And your meanie PC yeals: It is according to DMG RULES ! and we play BY BOOK.
Sometimes you just want to go home and get another beer.
Re: Storing Gold.
1. Of course it can get stolen. I never said it couldn't. Would it not be more interesting to have the PCs stash their hard-earnedc cash, it get stolen and the PCs have to retrieve it? Rather than simply blanketly saying 'no, you can't stash.'
2. Nice idea. Again, do that, rather than banning stashing.
3-9. etc. And why not introduce these rules/complications, rather than banning the stash. Indeed, these ideas here are very good: by allowing stashing you can probably make things more interesting.
Re: Gating Elminster.
Looking closely at Gate, you can't get unique beings (whether Big E is 'unique' is up to you). And yes, whilst you can get Elminster and play this tricks, why can't he then do it to YOU? If the PCs use cheap tricks, use them back on them. Except perhaps Elminster wants to teach the PCs a lesson, and not just nick their cash...
Re: Ghostform.
They played the same trick. But, firstly, why not do it back to them, and secondly, why not spoil their little parade. Disintegrate or Passwall can bypass the Wall of Force; or just ready actions. An Antimagic Shell usually does the trick...especially if a nearby colleague readies a grapple.
Re: 13th level spell.
Well, in theory you could scribe them, with one problems. No non-epic character can cast 13th level spells, and since you need to be able to cast the spell in order to scribe the scroll, no non-epic 13th level spell scrolls.
Re: Making Items.
Granted, but remember why the item creation rules are in the DMG, not PHB. They are the domain of the DM, and he should rule as such. If the PCs really insist on crafting uber-items, talk to them calmly and tell them they're breaking the game. If they persist, have your own NPCs make their own items...
Remember, as DM you have far more resources than even the most powerful PCs have hope to have. If the PCs insist on screwing with you, you can trump them. So they have an obscenely powerful item: why doesn't an evil deity simply requisition it. The game depends on the PCs respecting the DM- if that's not happening, then there is a serious problem with your group, and this needs to be addressed.