10nl Fulltilt vs Pokerstars

[Wilpro]

Have played at both in the past, all at 10nl and 25nl.
I was just comparing rake paid, and it seems full tilt charge doubled the rake at 10nl, but only give 27% rakeback.
Just wondering why so many 2+2ers play there at micro limits, seems that even after rakeback, you are still losing alot.
Here are the rakes

Pokerstars

10nl 6players $0.05 per $1.00 in pot, $3 max

Full tilt
10nl 6players $0.05 per $0.50 in pot, $2 max