Just because they were not looking for a prospective bride does not mean one might not have been in attendance. I know for myself, any gig I do, even simple karaoke, my cords, cables are hidden, table covered, and everything tied up nice and neat. You never know who might see your setup, and the impression they get can go a long way. If they were just "all about the money". Thinking more long term on potential gigs that could come from this one, or every gig you do, they would have tidied up. Odds are they were just lazy with the setup and anxious to start the DJ'ing part. If they show the same attention and care to how they tear down store and move their gear, it will be torn up in no time.. then unusable and again out of "money" gigs.
JMHO.