BGBedlam: Well, I didn't plan to create any action at all this year, so this one was started without any preparation or detailed rules. Ergo, I would like to keep it simple.
Maybe next time I will define more sophisticated rules, along with an automatic system that would prevent any possible exploits.
I guess that some people won't take it as a real membership promotion because of a "what's in it for me?" problem. It's their prerogative, of course. As I say, this is just a simple "let's try it and see where it goes" action, nothing more. For the time being, I would like to keep it as it is.