If you want to play the best regiments, then make your own competition between the regiments and stop bitching, the other 30 regiments aren't going to cry themselves to sleep just because you are leaving.
The low grade regiments want to take part to test their skills against other regiments to see how they compare even if they lose or win. They enjoy themselves otherwise they would have withdrawn after last seasons competition, some did and others didn't. You didn't hear them complain about losing to some technicality in which the score should have been different (I agree that the competition has flaws, which don't make sense) but just keep playing, don't think that every match is going to be like against the 63e.