The funny thing is, every single one of those participants thought it was worth their time. They looked for something to earn money, and found this. They clear

The funny thing is, every single one of those participants thought it was worth their time. They looked for something to earn money, and found this. They clearly thought the time/money tradeoff was sufficient. If you can earn a buck doing what a lot of (generally wealthier, admittedly) people do for free, why not?