Billy has a broken car. It's broken mostly because he doesn't know how to run it, of course; and more importantly, because it's making Billy rivers of money even though it's broken, so there's no incentive to learn to run it right.

Then Jerry drives by with an incredibly shaggy, shitty car, with a few nice accessories.

Billy immediately thinks: I'll buy Jerry's car, and use the parts to make mine less broken!

Of course, Billy still not knowing what to do with a car, it will remain broken, or best case, be fixed for a short time before he breaks it again. And it will still be hugely profitable. So to be honest, I see nothing wrong with Billy's logic.

Yeah, there's a reasonable chance it will make zero difference to Billy's car in the long run. But it will make people talk about Billy even more, which of course, puts more money on his pocket. Maybe even more than he's offering.