I print auctions to PDF as proof of sale/purchase because being a business, getting invoices to legitimize expenses from a second hand market can be difficult. Being able to include the pictures of an auction when printing to PDF is important for me as admin for a business, because sometimes it can take a while to complete a trade and the boss needs to refresh his memory of the item to know exactly which item of similar ones he's looking for, or to see the background to help remember where it is. And when purchasing, sometimes we need to remember "did it come with..." and looking at the pic...