When quality DVDs are available on the street corner in front of your house for sixty cents, displayed in attractive packaging, and people still don't want to pay that much, obviously there isn't a mentality of paying for software because you "like" the company. There's a mentality that it would be stupid to waste the money when you can get a free version that's just as good.
By the way, these sixty cent DVDs are either straightforward copies of the legitimate DVD but with added subtitles, or maybe they'll contain a complete season of a TV show on just a few disks.
The main reason they are not selling is, that there is a superior product available (online download).
The ease of use of an online download is greater than storing and inserting a pirate DVD to a player, which again is greater than an official DVD with10 minutes of forced commercial before the remote controller can be used.
The sad thing here is, that the original product is worse than what the pirates are offering (both bootleg and online), and no matter how low the prices for the original product go, the sales cannot increase before the quality for the end user goes above the pirated product.