My experience selling a draft novel on the Amazon Kindle
aaronrosspowell.com
aaronrosspowell.com
My "beta book", serialised novel is up on scribd http://www.scribd.com/doc/3717607/The-Cookie-From-the-Cookie... and therefore free to download. With 120+ views I imagine a good (read: low) pricing model might have created some sales.
Regarding feedback, however, my experience on Scribd and the original message board I created during serialisation in 2004 was lackluster. It's one thing to read - another thing to make the effort to contribute constructive feedback effectively.
I'd also point out that "people buying" does not mean "people reading". Still, we writers will always live in a world of optimism in that regard.
Unalone, have you looked into this?