Guys this is standard WoW rules - the same rules that apply to EVERY quest you do, the same rules that happened when BC came out:

If you're 80, the quest is gray to you, therefore you get a MUCH smaller amount of gold (~3g or so)
If you're 70, but you bought and upgraded to WoTLK, then the quest gives XP and only a small amount of gold
If you're 70 and you have NOT upgraded to WoTLK, then the quest gives exactly what it gave before WoTLK came out.

This is always how quests work and always how they will work.