Tank and Healer can hardly DPS, compare to other DPS who can do the daily quests more easily and faster.

Assuming: 2/3 of the daily $ go for repairing, while about 1/3 of same amount gold earned for DPS go for repairing.

They dont have much left to burn.

Enchanting - big $ sink.

Healer will be better unless his a plate-wearer.

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Suggesting roll another class to farm $, then why play Tank at all, that need to play 2 classes?

Be considerate for them, raid-noob.