How much do you think you are worth? The correct answer is priceless, because there's only one of you in the world, and the world needs you.
When it comes to the work you produce, that's when a monetary amount comes into effect. If you are in the J.O.B. world, your current salary is what you're earning, but it's not necessarily what you're truly worth. There are many considerations (economics of the area you work, job market, supply and demand, etc.) that determine what your earning power is.
If you're someone that is working on escaping the "9-to-5" world, and venture out on your own, you will be tasked with determining a price for what you charge, whether for products, services, and so forth.
Don't discount what you offer. Yes, maybe have a couple loss leader items in your "store", but don't price everything as a bargain, because it will diminish the value that customers perceive you offer.