It's not about the brand of car, it's that it was a dealership and not a low end used car lot. "Buy here, pay here" is a thing, they're in bad neighborhoods and run ads about how no one is denied because they do the financing themselves.

They're essentially loan sharks handing out cars instead of cash. They make a lot in interest, but they really make a lot by selling the same car again and again through very quick reposession (they do not mess around, weekly payments are standard). The same lot will sell many different makes, even higher end sometimes.