Just a heads up. That they're green lighted doesn't mean they're released. They're just approved, meaning that the development team has to actually work out the release with Valve, which it can take from weeks to months, depending on the state of the game.
Aladin, please tell us why? Free advertising on a platform that has as many users as any console, that allows talented people without a huge studio backing them to get a foothold in the market and make some money and a name for themselves. With the exception of Black Mesa which uses someone elses IP, every green light game gives the indie dev a shot at the big time - but feel free to enlighten us?