Not so far, but I have only started doing auctions this week. Some people have asked me to change things to free shipping and I just looked at the number of people that were currently watching the auction and if it seemed reasonable, i changed it to free shipping. If I didn't, I said I would combine shipping from different auctions that they won
You can always charge shipping within Listia guidelines. Just some FYI tho, you will get a whole lot more bids when shipping is free. Browse around and check it out for yourself....fanned ya and welcome to Listia :>)