Wow, you need a practical reason to own a gun! I'd probably not own at least half of mine if that was the case with me.It's a cool gun but I'd never have a practical reason to own one.
You need to go to more guns shows, firearms auctions, pawn shops and gun stores with lots of cash, buy some impractical guns, then to the range with lots of ammo for whatever impractical guns you bought and just have fun.