Hey Trexhunter22, I went ahead and tried to earn a profit in Jurassic difficulty Nublar North.
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Like how you mentioned, the hammond fee is at -$200,000. And I went ahead and tried to build an operational exhibit with a gallimimus in it, as usually a single dinosaur being visible would get profits up. But that is not the case, as it does help by increasing the ticket sales, the hammond fee jumps up a bit, so we are still in the red.
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However, I did notice that once I have built the gift shop and fast food restaurant nearby, not only did I start earning a profit, but the park went up to reach a 1 star rating.
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I then use this time to sell whatever fossil I could find and complete any possible missions to earn an income. I then brought in the other 5 gallimimus to the same enclosure, and raised the price of the food and gift store enough to earn a profit, but not to lower guest rating.
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Now I went and used the money to research for the dig yield, and used the upgrade to get as many treasures as possible. Which allowed me to build the ranger station, all of the laboratory facilities, and have enough money to build a hammond lab to incubate new species.
See below what the park looks like now, it only took 17 min to earn a profit, and 35 min to have a substantial income to get money flowing and start constructing.
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So I would say try to get an attraction running with a visible dinosaur, it just needs to be 1 dinosaur for it to be registered as an operational attraction. Then give that attraction the default gift shop, fast food, and restroom, and you should earn a positive profit and a 1-star park rating to get the necessary dig yield upgrade.
I hope this helps