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I think that High Seas was probably too big for a "booster", but it has the right idea... take the existing area we have ingame and update and flesh it out.
By the same token, the house tile packs were too small to be a real booster.
And of course such marketing strategies are only last as long as the producer, so I expect the whole system to change under our new producer as well. We'll see what direction it takes I guess.