Because that is truly the measure of a fair match, right? I am 58 and a non-coiner with about 700K power. Some of the coiners around here are lvl 51 with 1.5mil power. Why on earth would you make level the determining factor to decide whether a match would be even remotely fair or not? If you wanted to impose restrictions and make pvp more even, more of a match and more pleasurable to both coiners and non-coiners, you would impose those restrictions based on power. Give a 150K power range. anyone 150k higher or lower than you is fair game. By implementing a change like that, you sort of segregate (a little bit) the coiners and the non, allowing the coiners to battle among themselves while those that chose not to throw money at it, get their battles decided by rune choices and formation/hero choices, not by how much money they did or did not spend.

as it is, you basically grant coiners god mode over anyone that doesn't or can't spend $100+ on gems. Impose a power based range and you actually change pvp for the better. The level based range is just changing it for the sake of changing it, with no thought behind it at all. Knee-jerk response to a complaint without thinking it through.