If you have a set RP pool for a zone then players can earn RP in that zone as long as there are points left in the RP pool. At some point the pool will dry up in overused areas such as Emain. If people want to continue earning RPs then they have to fight in another zone. The pool would gradually recover over time.
Also playing a dual-wielding Saracen
The Drunken Ranger’s Guide to Drunken Rangery