I'd suggest the population at 50 is around 55 to 45 Imperial.
Quite often during the Ilum event I was outnumbered by Republics in the Northern section of the Gree event. Also, last night initially there was easily 100 Republics troops on Voss, if not a bit more.
If meaningful PvP events occur, the Pubs show up very strong.
heh idk man I think you're dreaming about it being that close...
70-30 is much more believable :P