That's not accurate. 75% is the maximum commission for sellers with 55% being the starting rate. 35% is the minimum and applies to themes sold non-exclusively.
A minimum of 35% (due to exclusivity) and a maximum of 75% to have a "buy with paypal" button. Now it's more accurate...but still sounds like ripping developers off to me. (that's, obviously, why HTML5 Admin is not listed there or themeforest or whatever)
Plus: since i've the honor to talk to you...i was thinking about joining wrapbootstrap...but you have ACE Admin (and others) which, for people that just upload their first template, are "way too much on top".
That really didn't help me (and really doesn't help new comers)...it's what i actually believ being a big problem of wrapbootstrap.
Do you see that as well?
Now we just need lower fees to make developers happier...or a service that can match the high fees (eg. possibility of create and manage affiliates, more payment methods, discounts, etc.)