Hi Cyberus,
I really didn't realise people systematically charged handling fees.
I usually always charge a handling fee. The handling fee pays for the following:
eBay Fees (I pay those fees only if the item sells for over $20.00, otherwise I make the customer pay the eBay Fees).
The Box and Packing Materials (I buy boxes and bubble-pack and special wrapping paper).
Wear and Tear on my car plus Gas to drive to and from the Post Office.
My Time standing in the long lines at the Post Office.
My time to carefully package the item.
My time to answer emails.
So, as you can see, the "handling" fee pays for a lot.
:-D