Breh, there are plenty of people who refuse to wear their ball sneakers off the court. Don't play dumb.
There are track spikes, football cleats, golf shoes, wrestling shoes (in Canada are pretty pricey), etc.
The last part of my argument still stands. If you have the cash and love the sport, why wouldn't you want to perform your best?
When you're playing ball, what's stopping you copping the pair of the Adidas in the discount bin?
You're also just building a strawman...now that I read into it more.