For anyone who thinks the lottery can be a good investment, this lottery simulator at Get Rich Slowly
is useful. Type in your picks and how many times you want to play, and the simulator will show you the simulated returns.
For example, I selected 6 numbers for the Mega Millions lottery and selected to play twice a week for 10 years (for 1,040 times). Here were the simulated results:
Mega Millions Games Played: 1040. Cost: $1040. Won: $72. Return: -93.08%.