Well let me throw out this idea.

A limited time Special of $20 for a year Rook membership or extension of of rook membership for a year.

I know for myself, I was unemployed for a year 1/2, and now working at a non-profit children center, so I'm now very "tight" with my money, so for myself I can not give money away without getting something in return - and if I could get a discount at extending my membership for another year, I would look at that very hard, and I'm sure others would also - especially if the money will be used towards a new server.