1. don't appreciate nice software (it's a rare thing, most programs are considered good if they don't have malware in them)
2. don't pay for software because they're 'smart' enough to use BT
3. don't care a lick about decent UIs because there's inevitably a free/open source program with that skates by on virtue of being free
The OS, as of Windows 7, is damn nice (though the terminal is terrible). The UI of the apps is almost universally bad -- most apps disregard the system UI theme for absolutely no gain, and they end up looking garish. Many apps that target the 'power user' demographic fall into a pit of endless customization, which presumes that users want to tweak their software using components written by random people on the Internet. It's as if no app on Windows is content to just do its thing, it always has to be striving to do more in a thoroughly mediocre fashion.