Yeah, that's the thing. Unless they're pretty good and know what they're doing (possibly a buyer lined up beforehand), they'll either get caught, sell it for a steep discount, or it will end up buried in their backyard somewhere. Actually, perhaps it's a bit different in Egypt because the authorities aren't quite as well equipped, but then again, the number of wealthy buyers will be lower. I'm guessing the people who stole the artifacts were low-level looters who will not know how to get rid of them.