Ideally I'd release all my works for free
I used to think that this was ideal too. But when you do that, you remove one of the most common and simple ways in which people can express appreciation for your work.
This really struck me the first time we started selling a game. Even though
The Graveyard didn't need to return on investment, and the selling was a tongue-in-cheek part of its artistic concept, I felt a happy jolt every time we got an email message from Paypal saying somebody purchased the game. I had not expected that I would feel like that.
We have also received messages from many people saying that they want to pay
more for our games.
So, in a way, offering your games for sale, is also a
service towards your audience.