why do some rakebacks have sliding percentage scales

[GrannyMae]

I'm pretty new here so it's probably not my place to say, but dam this site is weird about rakeback. For all the helpful info on other things there seems to be a conspiracy to hush any talk about rakeback. I guess there must be some history I don't know about.

go take a peek at RGP. it is the future of 2+2 if affiliate deals are not prohibited. the newsgroup is forever ruined, and we were headed that way 3 months ago. you could not find many posts that were not solicitations for a rakeback affiliate. it was ugly, and the mods did what they needed to do.