It doesn't matter though, they still lower my overall risk profile by being involved and (I believe) increase my odds of success. I believe it's a square deal.
I also believe that fundamentally if there's a time to aim high rather than minimizing downside risk in one's life, it's your 20s. Furthermore to a certain type of personality (mine) a secure life making a few hundred thousand dollars a year in an essentially mind-numbing profession that does little for humanity is unthinkably depressing.
It ain't for everyone, but I don't think it's fair to act as if it's some sort of sinister delusion projected by YC in order to benefit Paul Graham.