The scamp is a very "dangerous" character, in that he can generate unlimited gold for you in a very easy way (which I won't tell, but it involves soul trapping) which totally unbalances the game.
There is a more legitimate way though, head over to
www.morrowindfiles.com and get the "fence" mod.
It adds a fence,which in normal life is a vendor who buys all sorts of stuff without asking where it comes from, with 250,000 gold outside every Temple throughout the land. I don't feel that it unbalances the game, he's not a dolt like the scamp/drunken mudcrab (who gives you the actual value of the items you sell)..just like a normal merchant (you'll usually get like 40% of the object's value) but with tons of gold
Guess he's places outside the temple so that you can easily teleport out of some huge dungeon (with the divination scroll/spell) with 300 over-encumbrance of cool stuff, and manage to sell it off quickly.