I think it is something like this...

.07 Points per .1$ raked
at 7x bonus 1 point = .143$ which comes to .1$ bonus per 1$ raked
But at a 10 person table isnt your MGR 1$/10= .1$?
This would be 100% of your rake back, that can't be right.
I don't know what I'm talking about. Sorry, first post ever.