Quoting Kay plus Three:" What's your number one reason you love cloth diapers? Mine is... Never running out of diapers... And reading FB status updates of friends who ran out of diapers at ten at night "
Not running out of diapers.
The cost (my stash I probably spent less than 100 on, and I'm on baby number two. Most of it I'll put away for future kids and some I will give away (like, I'm not storing a million crappy prefolds for years lol).
I had to buy disposables for DD (size 4) and DS (size 1) for an overnight trip... $20 freakin' bucks. Yikes.