Right? Would be easy enough for a DM to just improvise if they don't want the players using everything. Big ticket items have inscriptions that terrify anyone they try to sell it to, which is itself a plot hook. Maybe it's all cursed. Or they get arrested by the local authorities on suspicion of trafficking in stolen goods. Or even just have another adventuring party steal it from them somehow.

Depends on the abilities of the party, but snatching away their spoils after they get away sounds even more fun than not letting them take it in the first place.