I set the prices of items. Guns cost in the thousands.
Yeah, but you have to at least test this kind of thing to make sure the prices are appropriate.
Unless the monetary system is based completely off of prices in the US, just putting, "something in the thousands" doesn't guarantee that it won't be easy to get.
Then again, I haven't played the game yet so I can't really disparage any of the prices you set. However, I highly recommend you make setting prices a priority because that's what breaks a lot of these kind of, "City" simulators.