The Mturk for cryptocurrency already exists (and works through Crowdflower) : https://coinworker.com/ I made about 0.2 btc there last year when I dropped out of university with no direct other plan. (But then I lost the private keys to that wallet)

Edit: clarify that I respond about the Mturk idea

I have a niche dating site that has had about 9 girls for every guy consistently for years. I thought the problem would logically take care of itself, but here is a real counterexample. As a guy with limited ladies-man skills, it still boggles my mind to this day.