Locally, I can't even get my book anywhere. The local comic store, Strange Adventures, turned it down because they said novels don't sell well at all there. The big local bookstore turned me down because Pro Se publishes through CreateSpace, which has a bad name among any bookseller that isn't Amazon (I guess they really undercut and screw over everyone else).
Basically because they are part of Amazon, the killer of brick-n-mortar bookstores.
They're considered a vanity publisher, and since it's basically free, aren't held in very high esteem by the book community.
My advice, it's free so you get what ya paid for, try expanding your writing arena. Dill is a very specific Noir audience, try working on some things (or thing) that is different. Fantasy, Sci-Fi, Adventure (can cover a variety of time periods), or even what you know best, a character that struggles with depression issues.
You've got talent, heck you can probably write circles around me while you're doing your DDP stuff, so don't give up, expand. Someone that I've seen give some decent advice about writing is Mark Evanier (
http://www.newsfromme.com/ ), he talks about a variety of things on his blog there, but has a recurring advice to writers entry that may be of help, or not.