Aningan: You really should read the topic and the replies better. It's good that Machinarium and others are coming to GOG. It's just not a big deal. That's it. They should just release a lot of them at once.
I think they have their own reasons not to release all games at once. May have something to do with marketing (so that people are even aware that such game has appeared on GOG; harder if it is swamped behind dozens of other titles released at the same time), or keeping people checking the site weekly, or most ongoing negotiations are still under negotiation, or they are still testing the games (when applicable).
If they released now 20 games in one day, and then nothing for the next few months, guess how much complaints that would cause? Don't be too impatient. :)
I have bought Amnesia and Penumbra Collection from the developer site DRM-free, and those games have been available for a long time on other sites too like Steam. Yet, I'd be more than delighted if they made a GOG release of them, and even make a big deal of it and releasing them one by one. No matter how, but those games belong to GOG as well.