Using esellerate for your affiliate system is a very bad idea. Their system does not support cookies. So it's almost impossible to keep track of affiliated information. The EST is a big joke imho, i receive so many EST updates that i gave up on redownloading and reuploading. ( it's too much maintenance to keep them up to date ).
Serious affiliates will only consider regnow and plimus. ( maybe bmt if you only have 1 product to sell... ).