Posted By:
ChrisHi Dan,
I think you may have just agreed with Andy -- you're right, it is an added bonus, which I believe is why people are willing to pay a premium for pins with fully in tact backings.
In my opinion it comes down to wanting to own a card, pin, etc as close as possible to its original "as produced" condition.
Regards,
Chris
edit: I'll add that I'm by no means an advanced collector...