First of all, there are no such things as full buff. I can say "common" buffs can be aquired from the NPC buffer.
Second, A grade is more than enough to farm with it (raids, mats ... etc)
Playing as support is need in mid-rated servers. Avoiding all classes than Cardinals isn't offering good buffs (dance of berserker, or great fury and etc, etc)
200 ppl online isn't so low. population depends of the adveristments.
Aniway - the server is stable, balanced and very well supported from gm`s. The player's community is growing constantly.
If You need 2k+ people online, to make some pvp, then You need some game-off time :)