Yes, this is common sense, but I doubt many people think about this.
If you want to get a few g (?) more from the quests you do from 60-70, do this:
Do instances only from 60-70, THEN when you're 70 you do all the quests you want. Because since you don't get XP, the xp will turn into gold instead. So that's extra money.
Now I don't want people saying "that ways better" etc, make your own guide. This is just one of many ways to make (extra) gold.
This will obviously take more time, but you will gain a lot in the end.