"no one buys a book based on the publisher,"
Unless, of course, the publisher is PA.
Walk into any bookstore and ask the staff about PA titles. If they have dealt with a PA writer before they'll either show one lonely title on consignment or it's there because the person who ordered never picked it up. Most of the time they'll say "no we don't carry those."
Since PA does not have a catalog, is absent from any distributors (like Ingram or Baker & Taylor), brick and mortar bookstores cannot order copies unless someone asks.
Order on line? Sure--if the PA site happens to be working that day, or if Amazon has one in stock.
How humiliating it must be to go marching up to a store manager, full of pride for one's shiny new book, secure that one is now a--ahem!--Published Author, only to end up begging for shelf space or a signing table --providing that the author spends her own cash on those books.
Then here *I* come wandering into the store...
:cue "Jaws" theme:
PA writers, trust me, you don't want that. I'm mean. I don't bite babies or dogs, but consider yourself warned.
Have a nice day!