Well the thing about Jurassic Park that is lost in the movie adaptation, is that John Hammond was a megalomaniac who (in my opinion) thought he was a god. He didn’t think anything he did was wrong nor that anything could go wrong for him.
The Ending
He and Ian Malcom get killed by a pack of compsognathus trying to get in the helicopter leaving the park.
Actually he isn’t lying about the expense. Chilean sea bass is on average $30USD per pound.