That's the problem with virtual currency like this, you have to create controls to address inflation and deflation, and certain groups of people always benefit

That's the problem with virtual currency like this, you have to create controls to address inflation and deflation, and certain groups of people always benefit from this. I remember another site based around trading books that used a virtual currency, and a lot of the early adopters got free credits to help seed the system, while the late adopters could only get credits by sending books. It created an imbalance from the beginning. Another issue is dealing with hoarders and retailers, which can damage the button system by putting too much virtual currency into the hands of only a few.