Couldn't help but log in about this one. I'm one of Harbor House's authors. Here's my experience coming with three books and a possible three more next year...
First, they've NEVER asked me to buy books, much less significant numbers, unless I was taking them to a convention to sell them myself. In fact, it was I who asked them about buying them.
Second, they offer an advance that is negotiable. $500 seems to be the norm, and from what I've heard, is not bad for a first-time author. Royalties are similarly negotiable.
They are not a vanity press.
They ask for author input on cover ideas (and will shoot down the bad ones) and hire good artists for their covers.
Downsides are, yes, the advance is a tad lower than I'd like, but as I'm still new, I'm willing to pay my dues (so to speak). Also, they expect you to do alot of your own promoting. Again, nothing to gripe about there, really.
Like I said, this is just my experiences with them. I've found them good to work with.
In case you're wondering, I'm the guy that wrote
An American Haunting (see their website) and I have another fiction book,
Deadlands, that is to be the first of their new BatWing press line. I also have a book of nonfiction/folklore coming out that is about real ghost stories called
The Mayor's Guide to the Stately Ghosts of Augusta, which is the first of a series of books.
All that to say, they've never treated me like anything other than a professional.
Just my $.02, for what it's worth.
Scott A. Johnson
http://www.americanhorrorwriter.com
http://www.horrorchannel.com