This isn't D&D, this is Star Wars. We don't see Han and Luke looting dead Stormtrooper gear on the Death Star.
To be fair, that's exactly what Luke and Han do in order to get the stormtrooper armor and blasters they use. We don't see them sell it because it's a movie and that's a boring logistical detail. Looting when you're victorious is both rewarding and something that's generally a given for any armed group that isn't incredibly well equipped. Now, I certainly agree that it'd be a huge pain to sell-off those goods, but (given the significant rule-set for negotiation, items and modding) there has to be some sort of credit generation for the PCs, and if it's not looting, then it's up to the GM to come up with some sort of solution to get the players their cash. The encumbrance rules pretty much make it certain they can't easily load up on seven-hundred items at once.