1 bills serve a very important purpose: you can place them within thongs or bikini tops being worn by strippers. This wouldn't be nearly as fun with a coin, and far more expensive with $5 bills.
You should try putting coins in the SLOT, it is much more fun.
It isn't easy being the parent of a six-year-old. However, it's a pretty small price to pay for having somebody around the house who understands computers.