Micropayments of this sort are one of those use cases that people have been trying to put into place forever, and they always founder on the fact that users hate them.
I put on virtual pyrotechnics shows in various grids and and get paid or tipped in either the grid's own digital currency or in Gloebits. Gloebits are better since they can be spent on various different grids and by all my accounts. I also take paypal.
