it's childrens week and this year there's prizes. you can pick a pet, or five gold
this quest is avaliable to all levels!
you'll need four people to do it, but you can make a lot of money even split four ways. and if you're lucky you can just con a few players into helping with the summons without telling them about the profits and without them asking for a cut
you'll need a warlock. a level one alt and two people to help summon
I think you can probably figure out where this is going...
head to either Stormwind or Orgrimmar depending on your faction. pick up the quest from the orphanage. for Alliance you'll need summoning to Darnassus, Theramore, Westfall and Loch Modan
once you have the gold, transfer it to your main. delete the alt and make a new one. repeat as many times as you please
it's slightly quicker than grinding, especially if one of your summoners is a mage (portals) and without the repair bills