The answer to the title of the thread is infinity.
The question was about individuals say who have more than 250 activity levels n zero merit scores. I wanted to know if they can continue that way infinitely without any limitations which I understand does not currently exist ☺. What I personally felt was if there was such limitations, then someone might take effort to contribute good stuff even more so they have to get merit points to stay in the forum. That way they just don't take from the forum they are contributing too.
Hope u understand
Your question isn't very clear. Are you asking if there should be some system put in place to ban accounts that get to a certain activity level with zero merit?