They don't tell you a total you have to spend, but it has to do with how much you play, how much you accomplish, how much money you spend and how much time you spend on the forums, twitter, and Facebook for Glu as well or that's what I was told
Great input tommygunn if everyone thought that way... My club is awesome like that just sometimes some don't play as often as they should but I understand life and people have jobs and family too...