I will make a similar comment as on the post concerning nodes but I think it is a bad idea.

Not that I don't want to get cheap cards (I do!), but for a community to work smoothly together, a feeling of justice and equality is absolutely necessary!

Screwing the old supporters and giving a discount to the newcomers will only make people want to work against one another. It will be (even more) a race to one's personal profits an create a very unwelcoming atmosphere.

The whole "we can earn all together" idea seems like a utopia, but it actually works better than the "battle royale" scheme.