it's a bit of a minefield this. I wouldnt someone a monthly fee to sell my music basically. Unless i was totally 100% sure that the sales they would help me get would cover that fee. What happens if you put some tracks up and no one buys them, and maybe not because they arent good tracks, but maybe because of other factors they cant control, like poor promotion on part of the website, an unworking website that throws up problems etc etc. Especially not when it's not that difficult to sort out distribution from the bigger mp3 lots such as Beatport, Trackitdown etc etc who will ultimately give your music a much, much wider audience compared to a, and no offence of course but business wise, a service that operates on a much, much smaller budget and doesnt have a reputation to help it along the way.

personal level, great idea, of course, always good to push and help others push good music. Business wise, alot easier for even relative newcomers to sort out much more comprehensible, workable and beneficial alternatives. For people who've had good success with their records too so far, it's even easier, hook up with the right labels and the label's will take care of all that anyway