Wwe can't get on any channel because they are on USA. First off there's no bigger network short of TNT or ESPN. Secondly to be on USA they signed a no compete cable clause that stops them from being on anything but universal owned cable channels - G4, Cloo, USA, SyfY, Bravo, Style, E, and HD Universal. They could only be on broadcast (ion/CW/my tv) or superstations (WGN and tbs) which is why SDs market was so limited.
if they didn't have the no compete over their rad bet your ass FX or Spike would pay them to get high ratings