First of all they aren't selling max levels. If they decide to let people buy 90s it will be after the expansion is out and the cap will be 100. You still have to level through the new content.
Second, I really wish people would shut the hell up unless they can atleast give a reason why something is bad. 99% of these stupid post about any "slippery slope", people never say what is wrong with it or what damage it can cause. They always just claim its bad because it just is. Either provide a true reason why this is bad and what problems will it cause or shut up, that simple.