As a non-regular baby user, this frightens me!
I worry that, if this were real, people would take earning bitcoin from posts far too seriously. The system also seems a little complex, especially as Hubski already takes a little while to get down pat. It's a neat idea, though.
Perhaps, if this did become real, you would only get an "account" after you've filled your wheel once? Though users should be free to just hit a "donate" button at any time.