It all depends. There are to many variables to set an absolute revshare percentage as being acceptable or not acceptable. For example: Say you have 2 sponsors that have a membership fee of $20.00. Sponsor "A" is paying out 75% and converting at 1:2500. Sponsor "B" is paying out 50% and converting at 1:500 on the same traffic. Pretty easy to see which is the better deal for the webmaster.
