I checked out D2D. Although an awesome idea on the surface, I'm a bit suspect of their pricing model. 10% of all sales? The problem with that is if you have a bestseller that sells a million copies you're basically subsidizing other books with languishing sales.
I'm not sure if you're affiliated with them or not, but a better model would be to charge 10% up to the cost of proofread and copyedit + a profit. Let's say these services typically cost $3,000 (like on CreateSpace). D2D could charge 10% of sales up to say $5,000 ($2k profit). If you're book doesn't hit its targets the author would still owe a remaining balance up to $3,000.
This would all make sense if D2D were a publisher. It's a distributor like Smashwords. I doubt the hits are doing that much subsidizing. eBooks are tiny files, and storage is cheap. All they did was clean up the .doc file for one book and keep on Apple when they gave me trouble publishing another. That's what I meant by handholding the manuscript.
I'm not sure if you're affiliated with them or not, but a better model would be to charge 10% up to the cost of proofread and copyedit + a profit. Let's say these services typically cost $3,000 (like on CreateSpace). D2D could charge 10% of sales up to say $5,000 ($2k profit). If you're book doesn't hit its targets the author would still owe a remaining balance up to $3,000.