I don't think that's quite correct. I see "gamers" being more marketing-sensitive than they are price-sensitive. There are sales in many other places but for whatever reason they don't get as much public exposure as the Steam sales. Even though almost all of it can be acquired for free, people tend to contribute financially to what they think is the least fraudulent option because they certainly do see the service value in purchasing any kind of content. Unfortunately, when it comes to this content, most people also seem have no idea how the publishing business behind it works. Of course all the publishing companies want to keep it this way.