Capture by trap building put a little cheese in the trap and bingo a mouse will appear. The Nazis recruited folks in such a fashion.

Let's see if they allow for re-sale! In order to boost efficiency, one could open another task market with a different currency, where amazon's tasks are also listed. People performing amazon's tasks will get paid in this currency, while amazon pays to the issuer. Thus, the issuer's currency can be used to buy from Amazon, but is not limited to it. Unfortunately, many on-line businesses (including Amazon) are very adverse to on-line re-sellers, because they perceive it as someone eating their lunch, which is not justified, IMHO, since if they offer goods X for price Y, they should be happy to get customers willing to pay Y for X, no matter who those customers are and what they do with X after the purchase.