People also pay for wallpapers, music and fireside DVDs. So why not pay for a little ambience game that might make working on the PC a little more enjoyable?
Yes people pay for it, and I think there are far worse things to spend your money on.
Everyone has to decide for themselves. I've been making games for 20 years, I've always paid the costs for artwork etc myself and often offered my games for free. The game also subsidises a little of the costs I have for other games.
Thanks to everyone who supports me!