Please - don't put words in my mouth. No where did I state you need to experience every single aspect of the game.
What I am saying, If I were new to a MMORPG I wouldn't want to use a jump potion or purchase one for that matter. I want to experience the game (level up, do the story etc). Is that so bad?
We don't know that. We don't have access to SE's statistics. Could be alts like you theorize, could be new people.