Anyone can give a single, tiny reason to actually play endgame PvP? [...] Or leave the game and move somewhere else?
The only reason to put up with this game anymore is if you have friends in the game with whom you can play together.
PVP balance in this game jumped the shark a long time ago. The core mechanics are amazing, but too many additional things that ignore the original balancing of this game have greatly reduced the quality of pvp (and that these things are money/grind-gated doesn't help either). Unfortunately the developers are neither capable nor courageous enough to do anything about it.