* Freedom 1: The freedom to study how the program works, and change it to make it do what you wish.
* Freedom 2: The freedom to redistribute copies so you can help your neighbor.
* Freedom 3: The freedom to improve the program, and release your improvements (and modified versions in general) to the public, so that the whole community benefits.
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.