I don't participate in swaps. My reason is different than the reasons already mentioned. I have had the experience of not being acknowledged when my item was received in the mail by my partner. My best quilting friend has also had this experience. Ironically, both our partners (at different times) were the swap hostess! Yes, there was tracking data to prove our packages had been received, and there was the partner, on the board chatting happily about her storage container solutions or making something for her mother in law, but no PM or public post about just getting the items from me or my friend.