Honestly the battles would be much better if the whole server could converge on indar during prime time like they used to.
it's definitely 1000 or more because a second continent used to open at 900 players online untill recently. the 600 is merely the new number where a second continent opens
Until DBQ forces people to play on servers where they have good ping, they will continue to limit a continent to 1200 players and even that is probably too many. Asians...uh hum.