Why I do care quite a bit about that topic is, that I prefer to base and reason my RP with levels as well. I do know many players who do RP their training in the arena, at the anvil, the furnace, where.. for instances, and I emphasize and second that. In fact there is enough room and space for everyone.
Though, I have seen also a lot of players who, lets take the arena, rush through it, and take all npcs in reach, the ones other players are about to train with.. no, even the ones not in reach. I even know of players who intentionally attack npcs for the only reason to take them away from others (proper example is the use of Dazzling Light spells), without finishing them at all (sic!). So that behaviour I call the one of PLers, reckless and destroying the atmosphere completely.
Besides the fact that I am forced to bend my RP with a doubtful reason, the plain experience of such an immature behaviour annoys me that much, that not long ago I was pondering seriously to leave this game. I have a few friends in PS, and I like the very decent amount of deep roleplay there, not to mention the joy of watching the game improving, hence why I care.