I see, you’re creating a strawman now. Interesting.
I don’t demand mages whom aren’t in my group to make me portals / water.
Mages usually offer water / portals in dungeon groups.
I don’t demand tanks tank dungeons specifically for me for free.
I just will not pay a tank extra to do the job, there are other tanks in the world that either want to do the dungeon, or are prefectly content trying to farm gear / get money from drops.
There is no need to pay a tank to do their job role in a dungeon.