This is how I read his question. Seems to me, the Warrior is the tank. If a Warrior is in a serious raid/Instance guild, then having the main tank "job" would be work at times.
Often, when I adventure with my wife, I take lead role, I choose the quest we'll work on next, look up the coords on how to reach the quest and lead her, (as she loves the follow command) as we head to our destination. Once we arrive, I commonly play the front fighter and she plays the support.
Examples being, my 65th Rogue and her 65th Priest. But we have one set of characters that we play, our 50's. My Lock and her Warrior. When we play those two, I am not "working as hard" because she is the one doing the leading.
Seems to me that the Main Tank duty would be work. I got my gnome Warrior to 33rd before I deleted him. Why? Because he was not any fun to play.
I see both sides, It can be work, but like you I wouldn't pay someone to adventure for me. Laughable.
Bo