Eh, I don’t know if everyone actually knows that they’re unenforceable. I’ve never dealt with one of these, so I’ll admit that I’m shooting from the hip, but I’d guess that usually a non-compete comes with what I’d imagine to be a pretty decent salary and benefit package, so I could see it being a tradeoff people will take despite not knowing what the company is like as they’re pretty jazzed on the money aspect. Plus, if a former employer were to take you to court, you probably would still want legal representation even if a judge throws it out, which will still cost you a pretty penny. But again, I don’t have any first-hand experience in this regard.