I wouldn't say that. It's when you hit 60-ish and are able to farm the River Temple instances. Each solo run rakes in roughly 10g. I hardly farmed with my Ranger so I'm doing it with my Shaman. I'll probably be staying in that level range and farming for some time to collect money.

76+ is when you are able to do this daily quest which if you complete all three gives you 120g per day.