I sell on ebay and while I don’t go that far out if my way I do put a little thank you stamp on the packing slip, make sure everything is packed correctly and I go out of my way to make sure that the item is shipped either same day or next day if they order later in the day. People are always grateful that they get their items so fast. I often ask spare parts for things, but even things like cassette tapes I imagine that they want it for the weekend or it’s for a gift for someone.