It's probably a negligible portion of drunk driving incidents, but there definitely are people like that. In the past year there have been multiple drunk driving incidents with well-paid NFL players in nice cars, and these are just the ones who get caught. Whether those guys would turn on self driving mode is another question I guess, but every time it's baffling they didn't just request an Uber Black or something.
That tells you that the "cost" of taking an Uber isn't primarily monetary. It's a big hassle to leave your car at the bar, take an Uber, wake up, get another Uber, go get your car, then drive your car back home. People are weighing that hassle against the odds anything bad will happen on their trip home and deciding it's worth it.
