I know it's boring but on the technical side it was hard to conform my art to Fine Art America's site. They limit the size of file you can upload and typically my native files are between 20 and 100 times larger. Does that mean the quality suffers a little? Well yes, but you may not even be able to see the difference.
Do you actually sell off these types of sites? Yes. But each sale I make has a history of my personal leg work building relations with buyers. People don't want to buy art in a vaccuum, they want to know you. I'm working on that.
As a college student, it's hard to find time to social network but more and more it's becoming necessary and I welcome the interaction with clients for my art.
I have several favorites I would like to share with you: