They have two copies of books by Scott Mackay on the shelf, including his book Phytosphere, which is out of print for long enough that we have a reversion of rights.
They don't have and never have had a copy of a Lost Fleet book by Jack Campbell. These books are not only in print, but have made the NY Times bestseller list.
And there's no sign that they will be getting any copies of the Warbreaker mass market by Brandon Sanderson, or the Warded Man mass market by Peter Brett, as two examples of March releases that I would expect will enjoy strong sales.
So they clearly don't have anyone buying the sf and fantasy who knows anything about sf and fantasy. They don't have very good inventory management, because their relatively small sf/f section has plenty of books that just aren't very likely to sell.Based on the concentration of odd books they have from the DAW/Roc list, it's clear they look at the monthly NAL mass market catalog more closely than some others which may imply that the Penguin sales rep is better than some of the others that call on this account.
Now, I love all my book children equally, and I was certainly happy when the Scott Mackay books came out that Posman was carrying them. At the same time, I do get that weekly Bookscan report card and I get royalty statements, and I know which books are selling and which are not. Independent bookstores are just much more likely, especially away from the categories like lit fic or children's they really care about and which motivate the owners, to have sections like this that ooze inattentiveness.