Oh yes, I think this is a very good idea. 
I think it would eventually need a menu that allowed you to choose what you would reward and how much for. I assume most people would want to reward reviews written (and maybe helpfulness?).
I'm not sure about limiting the rewards in a day as that would become difficult to justify to users (especially if you were converting rewards into money) - maybe you could just flag up users with a very high activity level.
Having just reread your message, I see that the thought was to reward logins so I suppose this might cause problems if people just kept logging in and out - maybe you would need to limit this to once a day if you decided to reward it?
Laura.
The UK High Street
I think it would eventually need a menu that allowed you to choose what you would reward and how much for. I assume most people would want to reward reviews written (and maybe helpfulness?).
I'm not sure about limiting the rewards in a day as that would become difficult to justify to users (especially if you were converting rewards into money) - maybe you could just flag up users with a very high activity level.
Having just reread your message, I see that the thought was to reward logins so I suppose this might cause problems if people just kept logging in and out - maybe you would need to limit this to once a day if you decided to reward it?
Laura.
The UK High Street
