I'm willing to be that 95% of developers you've worked with are, but how representative that is of the broader group is indeterminate. Apple is full of developers who give a shit about design, or at least, had to pass an interview that pretends that they pretend to give a predend shit... look, at some level you just have to buy that people are who they say they are. Even if you're in it for the money, you're going to conferences and speaking about it to people, so it's you.