While we do have some Dynamix games, some of those have changed ownership hands several times since Sierra was broken up. The others may not all be owned by the same group - or worse have unclear/multiple owners. So there could still be legal issues.

I actually just came across EcoQuest on Abandonia a few hours ago. EcoQuest 1-2 + Dr. Brain 1-2 + Willy Beamish would probably be pushing how much GOG wants to provide for just 9.99, but perhaps EcoQuest 1-2 + Dr. Brain 1-2 for 9.99, and Willy for 5.99 again.

Never played them, just seen a little gameplay on YouTube a few months back, so I'll take your word on the details here. Willy did seem to be slightly more "mature" content (well, the 10+ crowd, perhaps) like a large-breasted nurse and perhaps some cartoon violence (don't know about language), so it's more in the category of Monkey Island or Sam & Max presumably.

I haven't seen DCT posting here in quite some time, but I know he wanted to see these titles make an appearance. I'd enjoy seeing them come because it would encourage the idea that GOG is still willing to bring good old "younger folks" games, hopefully leading to Humongous Entertainment.

Only $5,99?
Hello? You have a sex scene in it! And you could betray your already pissed girlfriend with a tramp and lose the game a couple of seconds later when you accidentially cross paths with her. Thats priceless

In all seriousness:
I never played that game fully voiced back then. So for the "talkative" version I wouldn't mind spending $5.99 but then again, it's only me.