timppu: Yeah like the others said, what's in it for GOG? Ok so Steam still carries it, no idea what Valve thinks they can achieve it but I guess they have automated it for the most part how new (even free) games get accepted to the system.
I personally don't consider it important that free (open source) games that I can easily obtain online, should be also on GOG.com (or Steam). I can just download if from the original web page, right?
There certainly are many good free games like e.g.
Rolling Madness 3D (a great remake of the Marble Madness arcade game) or the
Wizball remake or those great fan-made Star Wars games ("Battle of Yavin" and "Battle of Endor"), but I personally don't see why GOG should host them.
The internet is full of quite good freeware games that GOG "could" host, but why? Perhaps this serves as an explaination.
Because the afformented/described games are based on established and desired classics (openTTD is based on TTD, which is based on TT). So putting them on the store is essentially subsidizing the original game, making sure more desire is building up for the original in the process. Its kinda like those Xcom remakes, some people who play those want to play/buy the originals as well, or maybe its the other way around. It really depends on costumer-desireability, which is often difficult to evaluage.
Same cannot be said on BoY and BoE, which are basically fangames. You could say that there are mods for certain games out there that achieve the same (such as the Star Wars Freespace 2 mod, which is superior to the examples you've given). On the other hand GOG doesn't care that much about modding just like they don't care a lot about freeware games. So in a way, there are more ways (either get the BoE or mod FS2 that includes BoE with modded ships) that achieve the similar, or even better, outcome. You could argue that those fangames enables desire of entirely different games though. When I think of BoE I think of Homeworld mods, for instance.
The reason why I wanted to make this thread is because It has a lot to do with GOGs image. Think of it this way, most of the games released on GOG were abandongames before and are/were accessable over on certain sites. These abandonware games are however not "the version you can buy on store". An abandonware game will never feel like the version you've bought. In a way, its a similar subsidization that crystalized from demand alone. Why do you believe the wishlist exist in the first place? For most people, people could still go and get the games a different way, they purchase games on GOG because of the image attached to the store. Otherwise you can just ignore GOG and move on.
I believe that GOGs biggest problem is actually a very subtle one. To give an example, GOG paywalls freeware games like Spelunky. You can only play the freeware Spelunky on GOG if you purchase the game, even though the freeware is accessable elsewere. Iignoring the reality of freeware/modding, two vastly important subjects, that halts the growth of this site. But perhaps there are more strings attached to this that I don't know about.
I would love a subsection of GOG (similar to the wishlist subsection) where GOG-staff or certain users could write up blogposts regarding freeware games and modding, complete with tutorials and stuff like that. So real in-detail write ups about freeware games, complete with lists and all that stuff. Kinda like a curated blog of sorts which is infinitely better than forum posts and writeups, for obvious reasons (one stop shop and all that).