The thing that really kills me about Craft(alchemy) is that it becomes a mostly useless skill once you reach a moderate level. The items crafted are useful for a low level character, but once a party has a sufficient repertoire of spells and magic items, the alchemical items become nearly useless. I can only see an economical interest for such a skill (i.e: earning money by selling alchemical items) for a guy of 10+ level.
A gnome Rog5/Wiz7 I've been playing lately happened to have nearly maxed the Craft(Alchemy) ranks upon advancing every level. However the adventure developed in a way that prevented him from having enough time on a lab to do his items. The fact is that he now is a level 12 character and finally has the time, funds and lab to cook his alch's fires, tanglefoot bags or thunderstones because he rather uses his scrolls and spells. I feel like having wasted ranks in this skill.
This Craft should have better items at higher DCs to avoid this.