What are your best reasons to start a coin collection?

There are many reasons to start a coin collection ... as to which one is best, that has to be determined on a personal basis : 1) as a hobby 2) to learn about coins and history 3) as an investment 4) something to get you out of the house once in a while (like some wives suggest) 5) boy scout project 6) a shared interest activity with a loved one or any combination of the above.