We often have republic vs republic on The Crucible Pits also, there are more Imperial players though so I'm not sure why it happens, perhaps they are all carebears?
There were a ton of Empire players on Ajunta Pall who queued up for warzones when it was 10-50.
Since 1.1 went live with the separate 50s bracket, Empire has been losing the majority of warzones I've participated in for both brackets on our server. The # of Empire players queuing for warzones has dropped.
If you play Empire and want a server with a healthy Republic population and competent players, roll Empire on Ajunta Pall.