10. It's a tight squeeze in there.

 9. "Lady of Spain" is so out that it's in again.

 8. You'll be much more interesting than your friends
    who just play ordinary instruments, like the piano
    or guitar.

 7. It will embarass your teenagers. (Since you do
    anyway, you might as well have fun doing it.)

 6. You can always make some instant income. Park
    yourself in a pedestrian mall, squeeze out
    some tunes and collect lots of cash in your
    accordion case.

 5. You can entertain and build upper body strength at
    the same time.

 4. You could be the first to add accordion to a rap
     music sound track.

 3. You're tired of line dancing and ready to polka.

 2. You need a new way of relieving stress.

 1. You'll find out who your real friends are.