Head To Head

Whats a good reasonable winning percentage for Head to Head tournaments. Ive been playing the $2 and $5 H2H on Fulltilt this month of July and have a winning percentage of 55% over 50 games. Thats a few dollars my way but not alot considering a months worth. Does anyone have an idea of how many times there cashing in H2H and what a good player on average should be looking at.
Thanks