I had two exceptions to this buyer sends money first rule.
Many years ago when I sent my Nakamichi deck to Willy Hermann for service for the first time, he sent it back to me before I had any opportunity to mail him a check. It was so usual that I asked him. He said : " You know, I have found the owners of high end Nakamichi decks to be a very trustworthy group, have never had problems of this kind with them".
Another example was when an Audiogon member selling Echole cables suggested he send them to me and if I wanted to keep them I would pay, if not - returned them to him. Great cables, by the way, but too damn expensive. So I declined his offer but was really impressed and told him so. This too happened a long time ago.

