I very seldom sell artwork online. Most of it is to friends, family, coworkers, etc. As people in my "circle" get stuff, people in their circles see it and then ask about getting stuff... Works out good that way, and puts me at a little less risk of getting scammed than with strangers on the internet.
Well... I haven't sold to any COMPLETE strangers yet, but I have included online acquaintances I haven't met yet among the friends I've sold to. One of whom had a meatspace friend vouching for him, and one of whom I'd been talking to for a long time before things got to the "can I pay you for art" stage.
...And yes, getting paid is very nice. Not my first time but it doesn't happen frequently, although I hope to improve on that. :p