The problem with this perspective is that by merely occupying so many routes, you place the burden on the other users to have to go and ask. Most people avoid conflict and I know I would rather just go elsewhere than have to enter a large group, not knowing who is running things and boldly make some request in front of a big group, only to be told that someone is climbing that.
Grow a pair and speak up. Jeez, it's not hard.
"hey, can I jump on a route here?"
real tough.