Ask HN: How much should I earn from online freelancing?

Hi.. I am working on freelancer website: http://www.freelancer.com/affiliates/ahmed613/

I am currently making around 1500 to 2000 USD per month, and I am web developer with extensive experience in web APIs.

I feel that this is a too low income, comparing it to the average American developer's income..

So I need to know.. how much should I earn from online freelancing, if I work 40 hrs/week.. so its just like full time.

You can say annual or monthly expected income, or even per hour rate.

Waiting for your answer and thanks, Ahmed.