Storm Raven said:
That's what having rogues and other information gathering types in a party are for.
Gather Information is the best way to avoid role-playing I've seen. It is not easy to find out this sort of information. And often, the information just isn't there. Just because the PCs want something doesn't mean it exists in the city they are in. For instance, IRL it is rather difficult to purchase tanks on the black market in most countries. Whether you have connections or not, some things are just not possible.
Even if they find someone dealing in such items, it is going to have ~400% black markup, and they usually won't want it, since they can get better things by just adventuring. And the people dealing in such items aren't going to be able to just take an order and come back with what you needed. If it isn't available, it isn't available.
Of course that players could do some such thing, but it really isn't worth it, so they don't.
In my experience, most PCs (who can) are willing to make magic items in exchange to trade, even just to trade for cash. Not all the time, but every now and then during their career. If you want to come up with an "xp limit", a good rule of thumb would likely be 1/25th of the gold piece limit.
I disagree with that being a good rule of thumb due to markets not being completely based on supply-demand (I more thoroughly discuss this in a previous post). I've never seen a PC who would be willing to sell their XP for gp unless they expected to purchase magic items with the gp. It's a critical mass issue, which, in my opinion, would not be reached due to many of the other factors I talk about.
This is an element of every market. Magic items should be no different in this regard. But it hasn't killed the market in any other commodity, it just makes buyers cautious.
There is a recent trend discussed on Slate (I believe; I wish I could find the link to the article, but my search-fu is failing me) how spam/adware/spyware/worms have gotten so bad that there is actually a small market backlash against always-on internet. These things do effect the market. A healthy, thriving market can bear such things, but - due to the many circumstances I've illustrated - the market has never become so healthy. so this type of activity is a significant detriment to the market.
It can, but on the other hand, masterwork swords can be sundered quite easily too, but there are plenty of them available for sale. In reality, cars wear out after a few short years of use, but we have millions of them available for sale daily.
Masterwork swords are not nearly as expensive as magical items for their worth. Cars do not wear out after a few years. A part wears out after a few years and the machine can be fixed by the purchase of a cheap part. The maintenance on a car is very reasonable for the first 10 years, after which many cars get junked when something minor happens. It's just not worth repairing when the part costs half of what the car is worth (as is the case with magical items).
Now think about all of the people around the world who have weapons. Especially in less than completely civilized areas of the world (which are usually analogous to the places that adventurers would spend lots of time in). Do you under stand just how easy is it to get weaponry in Afghanistan, or Sudan, or Somalia?
I'm not sure what you mean by civilized, but I guarentee the level of civilization has nothing to do with weapon availability. Germany began to remove weapons from their citizen's hands before WWII; does that mean they were progressing towards a more civilized culture? Weapons and warfare were always the domain of the civilized in feudal systems (knights in western feudalism, for instance, or samurai in eastern). America in the 1920s could arguably be counted among the most civilized of nations in that period, yet tommy guns were available by mail order to anyone who wanted one. I think on this point, you are just wrong. Maybe you should define civilized.
Gun control is a cultural decision that is based upon huge variety of factors. Again, this is just one of things that keep the magic trade down in the areas where "gun control" people are prominent, powerful, and active.
I believe that your understanding of feudal law is somewhat lacking. Note, for example, that contrary to your assertions, historical feudal rulers often had to borrow heavily from those in their lands to finance their wars and other ambitions (rather than, for example, just confiscating their property as you would have them do). The very essence of fuedal law was reciprocating rights: the lord had power, but he also had duties and responsibilities to his vassals. Many feudal kings were overthrown (such as Richard II) or curbed by force (such as John Lackland) when they were perceived to have trampled on the rights of their vassals. What you assert as an example of "feudal law" is probably more like the law applied by the pre-Hellenic asiatic emperors of the middle-east.
I did not make it clear, but I was referring to lords vs. serfs, not liege vs vassal. As most PCs can only be considered outlaws (or at best foreigners [there is a better term for this but I can't think of it] while adventuring), they would be at the full mercy of the lord on whose land they were.