On the general store page, the discount is 25% for the basic edition (€14.99 instead of €19.99), and 35% for the Deluxe edition (€32.79 instead of €50.49).

BUT, when you (or rather I) go to the game's pages, the discount becomes 50% for the basic edition (€9.99 instead of €19.99), and 60% for the Deluxe edition (€20.19 instead of €50.49).

I don't know where is the mistake, on the front page or on the game's pages... But anyway I got the Deluxe for a 60% discount. Just telling you all, in case it doesn't last.

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EDIT: Silly cat... I should have checked the previous threads. This happens when you already own the diamond edition.

If you own the deluxe version should the regular EE version say OWNED as well. I mean I’d assume the complete deluxe has everything the regular EE version has. Looks like it.

No, it doesn't.
Strangely, only the Deluxe Edition I bought is marked as "in library", and the basic edition still shows as not owned.

Yann_Darko is correct. I also purchased Deluxe edition and basic edition is not marked as owned for me -_- It's not a big deal... but can be annoying for some people. Let's hope GOG fix this someday.

Out of curiousity: Shouldn't someone who had previously owned the Diamond Edition get a 2nd key for the DE when buying the Enhanced Edition?

Not that I'd really know what to do with a second Serial Key, but just for consistency's sake...

Maybe that's why owners of the previous game get higher discounts, because they only buy one game instead of two?

That's actually a good point - I should have seen that. All sorted then. Thanks :)