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To my mind, this is one of the defining Bullfrog classics. I played it long before I played Populus, and it was this that first exposed me to the work of Molyneux and his team. And, indeed, for a large part, was what sold me on gaming in general. It seems odd that it's missing from the collection.
Quoted from the release article for the game (http://www.gog.com/news/release_theme_park)
Notice:
We're glad that another long-awaited Bullfrog Classic finally joined our catalog. We know that many of you were anxious to see it here. At the same time, we need to disappoint those of you, who were hoping to pick it up during the upcoming Winter Sale. This particular title won't be discounted this time, as the sale is coming too short after it's release. So, you can be sure you can pick it up today, and you won't feel foolish seeing it discounted in a few days from now ;-) Just a heads up from your friendly GOG.com team!
(Emphasis is mine)

It is worth 6 USD.
avatar
Sufyan: Quoted from the release article for the game (http://www.gog.com/news/release_theme_park)

Notice:
We're glad that another long-awaited Bullfrog Classic finally joined our catalog. We know that many of you were anxious to see it here. At the same time, we need to disappoint those of you, who were hoping to pick it up during the upcoming Winter Sale. This particular title won't be discounted this time, as the sale is coming too short after it's release. So, you can be sure you can pick it up today, and you won't feel foolish seeing it discounted in a few days from now ;-) Just a heads up from your friendly GOG.com team!
avatar
Sufyan: (Emphasis is mine)

It is worth 6 USD.
Ah. Missed that. Shame.