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We have been using Thievery, but it was just until I asked the brains on this board for their advice.
Sammy
What I would do is use skill checks as a story hook. Perhaps a certain art object is "hot," and the PCs need to decide what to do with it -- return it to the rightful owner or fence it to the local guild or smuggle it out of the city to sell somewhere else? All three options open up story hooks for the campaign. You could also use gems that have some sort of possible side benefit to them ("Arcane lore suggests that lodestones have strange properties over magnetism and such forces"), possibly only discovered in limited situations (perhaps vs. certain foes or in certain terrain). There are plenty of possibilities. What I would not do is say, "Har har, you botched the thievery check and will only get paid 1/2 as much as is due!"
Appraise is a self-justifying skill, in my mind. If you don't have it, you don't need it.
-O
After all, the PCs are professional tomb robbers (more or less). Of course they know what's valuable and what ain't. (Plus a lot of good system arguments against skill taxes and against unnecessary bookkeeping and unbalancing the reward cycle and the Appraise skill not actually generating any fun and such.)
