Attending in person may save on shipping and buyer premium percentage, but you have to figure gas, motel and other costs. That item you got at a swap meet or distant auction really costs the sum of the item and all costs to get there and back. But it's all good if you really enjoy the experience.
I've gotten items from Matthews Auctions shipped. By the time you figure they actually pay people to pack, buy the materials and pay the freight, it is reasonable. I kept the last crate with the intention to use it someday to ship another sign. It is bulletproof, well almost.