Unfortunately even if endlessly re-releasing new versions (Legendary, Special, VR) stopped being profitable, locking the game into Steam workshop / Creation Club "exclusive" integration has had a significant negative effect on portability with other stores.

The cracked version of many DRM-exclusive games 'run supremely well' but the fact they have to be cracked is exactly why they aren't sold on GOG. It's also hardly fair to compare pirated versions of games that bundle 100x unofficial mod packs with paid versions when Morrowind, Oblivion, FO3 & FO:NV sold here (or any store for that fact) don't come bundled with Unofficial Bug Fixes, DarnifiedUI, OBSE, OBMM, MGE XE, FOSE, etc, all pre-included.

The question isn't what effort pirate groups are willing to put in to 'repack' Steam paywalled mods, it's what Bethesda are willing to put in to formulate special curated "Steam Workshop DLC" just for GOG users, and if they were willing to put that much effort into their games in general then those "unofficial bug fixes" would be official patches in the first place... PCGW Entry for Skyrim SE = "All versions require Steam DRM" = someone wake me up when Bethesda (not pirate groups) remove that DRM themselves which is exactly what's required to sell on a DRM-Free store...

Almost exclusively new games ...... Just lol at these sales.

These frequent sales help spread out my game purchases and better align me with my budget spending. I like knowing the general cost with the discounts when these promotions have their turn up and Gog and Bethesda likely target shoppers like myself. I'd like Prey and Wolf II, but wouldn't feel right buying both at the same time during this promotion. Fortunately, I know there will be future frequent sales and have a general idea of the discounted cost when those sales do resurface.

What I am sure Gog hopes for is a situation like I have in which I'd buy Quake IV for a discounted price, even though I have no interest or nostalgia for the title. I'd only like it since I have the others and don't mind throwing Gog a few dollars for their cut.

I agree here, there's plenty of games I'd want but I can't buy them all at the same time, both for money - even if they are cheap, if I'd buy more of them the cost will add up - and backlog reasons - I prefer to try to play the games I have gotten in the Summer sales or earlier before getting more unless the new game would be a priority.
My problem with these sales, beside no new games is the uninspiring prices, when this money is not even going to the devs but to some CEO and shareholders.
Also, the last added game, the C. Keen collection, that some might have missed, is not on sale. Last time the Heretic/Hexen collection was not on sale. Is Bethesda experimenting with sales frequency to see how it moves customers to buy on the good occasion, not relying on the fact that the title will often be available at the discounted price, in order to push for the purchase? Or they are just lazy and don't bother to cure GOG sales?

i would be totally happy with fallout 4, even sans mods!

I would like to think its strategic business marketing from both companies. Commander Keen and Hexen were somewhat recent additions to the catalog and it may be a request by the publisher and gog to see if they can still obtain higher revenue on these desirable additions. My wishful fantasy thinking is that there will be a commander Keen discount in celebration of Aliens Ate My Baby Sitter being released. Maybe Doom 2016 being released here will trigger an ID software celebration discount that will included Heretic/Hexen. Fun to dream and I respect Gog taking whatever financial steps needed in order to ensure their continued survival.

That's fair. I enjoyed my first playthrough of Fallout 3 while exploring the world, I'll probably do the same in 4 and ignore the main quest. :)
Now all it has to do is release on gog. :P

i wish