Even in my (merged) server, 2 Ex-Rank 1 players in over all ranked battles have quit the game and gave leadership to another player already. Now level cap has increased to 90 I don't think it would make any difference.
I am guessing the reasons that they kept creating new servers for new players, so they can rise their levels equally; other than trying to catch up to another players and got beaten to death in 1 sweep. That's not fun, unfair and very common things in every game of MMORPG. The faster you rise the levels the stronger you get.
When there are a lot of (top) players active/online. My 9-tails was killed under 30 seconds. You don't even get the chance to participate. It doesn't last to 3 min these days anyway.
GNW, there is always 1 group dominated the whole game. My server there are 2. They are equally in fighting power. There is no fun in that too. I can fight 1v3 other group who are weaker. SWB I left my team in Auto and played other game and still win at least 3-5 streaks -*-