We're keeping an eye on how many of them are going out, how many users return to him every day, what happens when we release new ones, etc, etc.

We had a few ideas kicking around before we launched on how to give them out (and if you should be able to do something to choose / put some of them in the CS / etc) but we really just liked this method best. It means a lot of trading is going on (and it is!) and instead of being valued at sP value they're mostly being traded for other dolls, which is really awesome.