well...
not to be "picky", but that's not a code or cheat, it's reality. A real-life park can charge a crap load of money for each ride especially if they're entrance is free. My county fair charges $5 to get in, and more than $5 for each ride... and they're CARNIVAL rides for peat's sake.
ok that was picky but oh well.
Anyways, it's meant to be like that, but yeah it's a good strategy
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www.angelfire.com/in3/rct