Yep , I guess like with most companies it comes down to money. And steam being a distribution service working with the manufacture , in both their interests wants to make as much as possible. Must be a line though where you have to keep your customers happy as well, or the idea of pirating becomes a lot more appealing and nobody wins.
In saying that I did recently purchase a game from someone who gifted me the game via steam, is that legal? Or only applies to certain titles?