I get it - you're being all "What if..." It's cool. If you keep going and really think it through, it just breaks down. It breaks down, to pick one of many situations, at the training point for any job that requires study. Take boat captains for example. There are millions of "boat captains" who play at captain on their little 25 foot boat on the weekend. However, to captain a boat containing 500 cargo containers from Asia to San Franscico - that requires months or even years of training. Who would go through such training if the "payoff" only was "I get a free trip to San Franscisco"? Oh sure, maybe you'd find someone who would do it once a year, twice a year but then what? Cargo would stop - if you have 10,000 ships laden with 500 cargo containers leaving Asia every day right now (a guess), where would you find the volunteers? Who would check their backgrounds? Who would be in charge of recruiting new volunteers?

It's just never, ever going to be possible. Without some payoff for doing a "job", people will not do it.