I don't have six, but I have five, and they are all fully used and fully filled.
Now, I have just four, as my iPhone 4 just died. Piece of crap...
Why would you have 5 or 6 devices ? Just curious
I've got 3, an ipad 3, an iphone 4 (given to me by my wife), and an ipod touch 64 gig.
I'll probably sell my ipod touch soon hoping there'll be 128 gig devices announced in September. So i often put the cost of an older device towards the new one, if i kept it it'll just keep losing value year after year