When you complete a random dungeon as Tank you should get 3x more healthpotion and gold as reward.
As Heal 2x more Gold and 1 mana and 1 heathpotion
By Exp there are Pro and Cons.
And as Tank you should get Gold / Exp / Healthpotion when you complete a specific dungeon too.
Thats helps and motivate Warrior and Druid to specc in Tank or buy Dual Specc.
I agree. Unironically i will be happy if tanking dungeons could make a good way to make gold because unlik in wotlk tank build really struggles when it comes to farm solo.