AndyBuzz: But there are no games with regional pricing except specific new releases. So if what you are saying is true, that would translate to either having the game in the catalogue or not at all.
I think it has being mentioned before that the reason behind regional pricing is retail shops and contractual deals with them. I could be wrong though, not really following the business part of gaming all that much.
If you are in the know and can shed some light, I would appreciate it.
Games released here before the announcement of regional pricing are flat priced, because that was the only model GOG was operating under. But you need to keep in mind that regardless of retail, the devs/pubs set the price and they had to accept GOG's flat pricing model. The flat pricing model (along or independently of DRM-free) is speculated to have been the obstacle for some publishers not being here, like LucasArts and Take-Two Interactive (no on can say for sure, as these things are always all hash-hash). So yes, if they didn't agree, the games didn't get a GOG release.
With regional pricing introduced, GOG's still going to try to get releases under the flat pricing model, but if that fails, games will get a regional priced release here. And yes, it's tied to retail publishing deals, but even with that out of the way, it's not up to GOG's sole discretion to switch prices from regional to flat, and devs/ pubs still have to agree to it. That means, that there's always a chance that a game released with regional pricing never goes under the flat pricing model.