Ixamyakxim: I think part of the "problem" is that GoG really is a bastion of extremely high quality games in a few otherwise "obscure" / niche genres. When I was gaming primarily on consoles, I flipped out when I heard about a little game called Omerta because consoles were by and large a wasteland of turnbased tactical strategy.
Not so on GoG. There's an enormous wealth of extremely high quality tactical strategy games here, and I've gushed and glowed about several. Likewise turnbased RPGs and adventure games. The point being, if a developer wants to release that type of game here, they have no choice to bring their A-Game. Because there are just too many fantastic offerings.
That makes sense, yes. The average quality of games is indeed higher on GOG than on any other platform I'm aware of.
They have added some turds both old and new, in some cases for the sake of completing a series (e.g. Master of Orion 3, Simon the Sorcerer 3D and Simon the Sorcerer 4, Lords of the Realm 3, Empire Earth 3) but also some standalone turds (Pixel Piracy, 1849: Gold Edition, Slender: The Arrival), as well as games where quality control seems to have failed (Omerta) and games like Crusaders of Might and Magic that were simply pointless to be revived as hardly anyone misses them.
But in general, the presence of so many classics and the increasing number of them does indeed raise the bar to a high level. This can be a bit of a problem for indie games made by tiny teams on a shoestring budget which are promptly compared to all-time classics made by famous studios on a high budget. Under these circumstances, practically no indie developer can hope to ever get 5 stars for their games because "5 stars is reserved for the best of the best" according to many reviewers and you can't in any way enforce a reviewing standard on people as everyone has their own personal rules for that.
Ixamyakxim: Price is a huge issue too. Let's assume I have no vested interest in any of these particular games and they are competing based solely on price. Just looking at a few screenshots and reviews, with my $14.99 in hand I can purchase Telepath Tactics... or Shadowrun Returns, Shadowrun Dragonfall, OR I can shell out $5 bucks more and get the newly released Hong Kong. Again, just based on a few screenshots, pedigree and word of mouth that's not even close to a choice. I hate to sound like I'm "ripping" on a developer who probably poured a ton of time, money and love into a game but that's just the reality of the situation.
This definitely makes sense, as well. Personally, I don't factor in price as a main criteria for rating a game because price is subject to change (discounts) so price/value is a pliable factor whereas the game quality itself stays the same for the most part. Unless it's a very bug ridden game that completely improves after a patch (e.g. Arcanum and Daggerfall which were unacceptable releases back when they were first released).
Nevertheless, sales numbers support your point entirely, that's just the way things are and no romantic wishful Robin Hood empower the small indie people thinking can fix that unless more people vote with their wallets. I do it sometimes but I'm too poor and sometimes too stingy to do it as much as I'd like to.
Ixamyakxim: I'll bring beer into the equation (I love beer ;) ). Right now, I live in a region swimming with amazing, fantastic wonderful hoppy IPA goodness. If you're a new brewer, don't come into this market with a mediocre IPA and charge the same price for a four pack, thinking if you put it into a few tall boy cans or a flip top growler it'll jump right onto the hype train with the rest. It doesn't work that way.
I'm afraid your beer reference is lost on me...I don't understand beer and I suspect I never will, and the more I drink of it the less I understand it, very weird! I stay away from it, maybe one or two beers per year at the very most.
Played a tycoon style beer management game from Germany last year but I can't remember its name. Everything with beer seems to affect memory in a bad way :o