With some really clever maths, I calculated the total gold you'd get from doing all this. Didn't double check it, but should be accurate.

The 2 group quests give 22g 20s for completing and 19g 86s for being level 80 when you do it.

The 12 normal quests give 7g 40s for completing and 13g 23s for being level 80 when you do it.

And the quest "Vile Like Fire!" gives 3g 70s for completing and 13g 23s for being level 80.

Total: 348g 61s