You're casting a really wide net, which is not accurate. I will only speak to my own experience, but Techstars is not what you're talking about and of the friends that went through YC and 500, they seem to say similar things (that it was good, amazing, edifying).
Disruptive innovations is created by all types of people - meek and quiet people, some people that have a lot of great energy but little focus, some people with great focus but no programming skill, women, men, and even small ideas can be innovative (to a lucrative degree).
If you've been through each program then the size of your brush stroke is "just a little bit" more justified: diversity is a good thing, incubators aren't hurting anyone, and there are people making amazing stuff happen from every possible angle (bootstrap? incubator? wealthy family money? friends and family? payday loan investment? SBA loan? government grants? on-the side while working full-time? champion angel investor?).