In my experience most trades and exchanges work out well. Things CAN and DO go wrong ….sending mail around the world is problematic. I am sure I have sent stamps which never reached the destination. And I accept that some stamps sent to me, failed to reach me.
It is an occupational hazard of Trading and Exchanging. Usually I think “no big deal”.
But in recent months, too many trades/exchanges have not worked well. It is just happening too often.
So….I will no longer be trading and exchanging stamps. At least not for the foreseeable future. This is a decision that I have not taken lightly. A good “exchange” is a good method of growing a collection at minimal cost.