Re: Forum ranks/positions/badges (What do those shiny coins under my name mean?)
I wonder if you lose activity points with that way, changing member role, do you lose your signature? 
Not sure if I understood you correctly but if you meant having a Member account, then losing enough of your activity points results in demotion then you're going to have a certain signature limit based on your new rank...- Also, certain ranks used to not get affected by this but ever since that post, I've seen a few users with those ranks getting demoted:
IIRC only Newbie, Hero, and Legendary members don't get demoted normally. Maybe I'll fix it at some point, but it's not really a big deal.