Why do these people exist?  Well, the short answer is we're a relatively young species and we haven't had any experience with having abundant food for the masses for extended periods of time. We'll figure it out, these are just growing pains. We will have the same kinds of problems with boredom when most jobs become redundant soon too. What would most people do if 90+% of their time became free time? That's the next big social hurdle, maybe even with some overlap with the food abundance hurdle. Good problems to have though! (I'm an optimist if you couldn't tell) :D