In lower pop servers like Zalera this happens. It's almost borderline harassment the way some FCs target sprouts. I've seen a lot of new players join one just to stop the invites without having to go /busy or they don't know about /busy yet.
So yes, please. Ask the sprouts before you send them a FC invite ^^/ Those invites can be just as intrusive as the RMT spam, believe it or not.
