GOG was always about delivering value to Gamers, if we get more of this nonsense in the future then the core values of this site can start to break apart piece by piece
GOG.com was build upon a foundation of delivering the best value to gamers. We know gamers are not stupid, and we know they won't buy anything we serve just because it's there. Of course we'd like to include all the DLCs, extra materials, soundtracks for free, but that's not always possible. For some of the games, it's possible to bundle all the expansions (or DLCs) in one package, for some it ain't. I can understand that you might be afraid that we're losing our values, but we're not. All we want is DELIVER the games. At the end, it's always YOU who decide--buy or skip. And we'd rather give you that choice now.
There are two problems with that.
1. Omerta was received so badly that "delivering the best value" really doesn't work as an argument here. Really, there seems to be a consensus in the community that this game was disappointing, mediocre, and overpriced already for the content that it had to offer. And you choose _this_ game to do away with the former practice of _not_ releasing games piecemeal, and give "best value" as a reason? I'm sorry, I do not understand.
2. You're actually devaluating every other new game that you're selling. So far, I really didn't have to worry about DLC when I bought games at GOG. I could be certain that the game would either be complete already, or that GOG would strive hard to _make_ it complete (see: EA expansions). I could be reasonably sure that I would not have to spend additional money to receive a complete product. Now, with this change in your release practice, this has changed. Now, when I'm seeing a new game released on GOG, I will start to worry whether there's a hidden chain of money-grabbing DLC attached to it. Again, I don't understand why you deem it a good idea to give users that feeling.
To give you an example: I actually went to GOG to buy "Eador: Genesis" from the current promo. It's cheap now, and I just received some money. But now I don't - now I'm worried that the cheap price might just be a teaser to later sell piecemeal DLC to me. So I'm making a mental note to first check the age of the game, and the likelihood of the devs to release DLC. I may still buy it, but I really don't like the feeling of having to check these things now, and I may not even have the time to do these checks thoroughly before the promo runs out.
Also, I'm sorry, the way how you say that "All we want is DELIVER the games" makes me indeed worry a bit. I actually like to think that GOG is about more than that, and that GOG does _not_ just serve random mediocre stuff and lets the users decide if they want to bite. :(