Rakebacks are bad business and should be banned. I will not promote any site that endorses it. Lets say I sign up a heavy player, one that plays high limits, 2-3 tables at a time for up to 40 hours a week. He uses my affiliate link and I do not offer him a rake back. Weeks later, he comes across an ad offering a rake back for absolute poker. He punches in the amount of hours, number of tables, and limits he plays into the rake back calculator and determines he can be getting as much as $1500 a month back in rake. He is going to abandon ship and sign up with this program and I lose a great player. This is not fair to the affiliate who originally signed him up.
It is also not fair for the poker site themselves. Lets say he never used an affiliate link to sign up, so absolute poker would be getting 100% of the rake. Now he sees that ad offering rake back, he is going to sign up and now absolute has to forfeit some of the rake to the affiliate who signed him up.