FPP's opposed to 25% rakeback, anyone have numbers for me?

[h_ven]

I was wondering if it would be worth it to move to Stars from Ultimate Bet?

I am getting 25% RB which comes out like this:
Hands: 21,656
Stakes: $0.50/$1.00 NL
Total Rake: $1348
Rake Back: $337

We'll call that $330 for every 21,000 hands of .5/1, 6 max poker.
Anyone have some numbers for how much you can turn your FPP's in for?