I think they made a huge mistake having sales so often. In the beginning it was a big deal having a "once a year anniversary sale" and people went crazy getting $30 titles for $20... myself included.
Now we know that if titles sit long enough they go to $19.99, $14.99, and even less than 10 bucks.
I know now that I can pretty much get any title I want for 15 to 20 bucks so I throw the titles I want in a wishlist and pick them off as I can afford them.
I also know that the limited quantity thing isn't much of a threat either... genre titles like Count Yorga Vampire and Scream And Scream Again have not sold out (and I really thought they would). Even the reissues of Rollerball and Thunderbolt and Lightfoot are still easy to get which I also expected to quickly sell out again...
While it's good for us, perhaps they've cheapened their label with all the sales and that, along with physical media in general, has hurt their company...