Tanks are always going to be a rare or if nothing else less common breed. In your average group set up a large part of the responsibility falls on the tank. They tend to lead the group, are often blamed or looked down on for making any sort of mistakes, are generally expected to magically know how a fight works or where to go regardless of the content and just have to work HARDER then other roles. Most DPS classes just pluck away on damage skills and don't honestly have to try very hard at all. Don't get me started on the amount of times one of the dps in my groups has gone afk mid fight for 10-15 seconds without word or warning. Healers have to pay attention more then the dps but if the tank is geared and playing correctly in anything short of boss fights the healing required for a Paladin tank is minimal at best. I can get though a 1 or 2 mob pull without ANY healing at all in AK, which leaves the healer to either DPS or in many cases to just stand there doing nothing at all.

You work harder, get none of the flash and pop of DPS and anytime you make a mistake it is easily apparent to everyone. I wonder why more people don't want to play this role... If tanks were not as rare as they are, being a good one wouldn't be a reward at all which is why most people even bother to play a tank in the first place.

Its just my rant/two cents but I'm personally glad tanks are some what rare. I don't wish long boring queues on anyone but if this %^&* was easy... everyone would be doing it.