We are not a library...

"Umm...Can you, like, copy this for me?"
"No. You can buy the book, but I cannot photocopy pages out of it for you."
"Ah...Why not?"
"Because the sign on our door says 'BookSELLERS' not 'Public Library'."
"Oh, what's the difference?"

This exchange happens every three months or so. C'mon people!