My two cents:
If you do not donate, you really can't complain. You cannot expect Warmane to front the cost on new hardware just because your too cheap to make a 10 buck donation. If enough people were to donate and they still have problems with server crowding, then they might do something crazy like buy more hardware to start another realm. I can't imagine them raising the population cap any further since it is already quite high. This would also support the influx of new players that would inevitibly come in. I imagine the only reason there aren't already 20k people in que is simply because after probably 4 or 5k it gets a little discouraging and they just don't even bother. If there were two high rate realms with a 12k population cap, I'd bet a dollar they both fill up and start a que just because it would attract that many more players.
But wait, why even talk about opening another realm yet? There's this other realm...the rates and content are a little tougher but if you're really fiending for a fix; they don't even have a que. It's called Lordaeron and the most I've seen on that realm in the last 2 days is 10.4k players. Still plenty of room for those who can't seem to dip into their funds and pull out a small donation.
TL:DR It ain't broke so don't try to fix it!

