Re-blogged from http://blog.wolfire.com/2010/05/Another-view-of-game-piracy:

Why are PC games really losing sales?
[...] it’s easier for these developers to point their fingers at pirates than to face the real problem: that their games are not fun on PC. The games in question are usually designed for consoles, with the desktop port as an afterthought. This means they are not fun [...]