I charge a nominal amount for packaging, even though I get it free, as I wrap everything very carefully and can sometimes spend a fair while hunting out the right box/packaging, etc... as well as printing out labels and all the rest of it. This mainly goes towards covering my eBay/Paypal fees, but I don't feel like I'm cheating anyone by charging it because of the overall time, care and attention I put in.
This is what I tell myself when I go to sleep at night, anyway! :lol: