But this is just cracked games without an cracktro and running in dosbox.
I mean I can get that from any abandonware site.
What's the added value?

the problem with abandonware sites is its 100% illegal
Gog is fullly legit

The added value is convenience. Installer, that works on modern systems. Easy tool to configure DOSBox to your needs. Manual and cluebook. Of course you could do all that by yourself and get the files for free on the web, if you think 10 bucks is too much for three games. For me it was worth it, although I already own those games in form of the Forgotten Realms Archive.

That is not true.
Abandonware is not illegal.
In fact I've been running a c64 site with game for 16 years now and even had received mail by some developers of some of those game that they were very happy to see their games on the web and wished me good luck.
It made me very proud as I put a lot of effort into that site.
It was even featured on Italian TV.

It's a grey area and I believe preserving those games mean preserving part of our cultural heritage.
The companies that created those game don't exist anymore.
You could even say GOG is taking those games and trying to monetize those abandonware games,
something that's always been considered dishonorable in the old school scene.

10 "bucks" is a lot of money for cracked games bundled with dosbox. It's essentially piracy.

Just because nobody sues you, doesn't mean it's legal.

Most devs don't own the rights to their games anyway. They sold them to a publisher, who then may have sold them again or may have gone bankrupt and someone else bought the rights in a bundle and doesn't know what he has or doesn't care.

The point is: You distribute those games without having those rights and nobody interferes, because nobody cares. But that doesn't make it legal. If the owner of those rights came forward, you'd go down.

The term abandonware does not exist as a legal entity. But in any way, even accepting it would exist, (game rights temporally not claimed by anyone and automatically free to download), how could this game be abandonware if nowadays the distribution rights of the game are owned by someone? of course someone that paid for those rights?

Even the "abandonware" sites use to retire the download of a game if that game is sold again.

And of course, some sites preserved a lot of titles and I consider it very positive.

I buy because its all done in a convient package. Trademark laws, as they are, are the true piracy.