Artists have a great potential audience
When people do artwork as a hobby they often try to sell them at swap meets or small auction houses but rarely do they make a decent living from their work. Even if it is good you have to get it in front of a wide array of people to reach your target audience. Getting an e-bay account will help you in this area as their are at least 3 million people daily on eBay at any given time looking for a large assortment of things- maybe your painting! The cost of running an auction is pretty cheap considering what you get for your money!