I started a Jurassic challenge on Nublar North. apparently the pre-placed dinosaurs cause a good profit for about 2 minutes. after that the profit diminishes but the Hammond fee is already over $100,000 and I haven't even gotten an expedition back yet. It should be noted that I am using the 1993 dig sites. It nearly immediately throws me into debt and I can't get out without selling everything I need to eventually make money. I'm not sure if it is fixable.