What should I offer my preminum paying members? Please help me decide the possibity

[kobescoresagain]

Okay I run a sports card trading site. I am wanting to have memberships that people can purchase and the money would go to help make our trading community better. I am going to have 3 different memberships. Here are some of my basic ideas:
Bronze
125 PM
Bronze Member User Title
Non-transferable

Silver
250 PM
Silver Member User Title
Member Website Advertisement in the *New* Member Page Box
Transferable

Gold
500PM
Gold Member User Title
Double the displays of the Member Website Advertisement in teh 8New* Member Page Box
Transferable

The member Website Advertisement is basically a small ad that is a link to their website. I have a banner system that will allow me to do this.

i am looking for other great ideas on stuff. On idea is that I have a store that has packs of card in it, and I could give them a discount.