In addition to the stories being too short: they use stories from other anthologies and I end up with books with stories I've already. 

I just read Sheer Pleasure by Maggie Shayne for a game.  I get to the 3rd story and I'm having major Deja vu.  So I look to see if it's a reissue of another story. Sure enough all 3 were originally from different anthologies.  I have the two anthologies that the 1st 2 stories came out of and already read and posted the 3rd.  So basically I paid for this book brand new when I already owned the other 3 stores.  At least I got from Amazon's bargain books sale. But if I'd known I would have gotten a different book. 

Grrr, I hate that too.  It's like the publisher just wants to publish another book so they mix up their anthologies and, viola, new book!