[Kevin Caulfield]

I'm a little confused about why someone would sign up for another exchange if they didn't honour their previous commitment. If anyone didn't receive my postcard I would hope that they would let me know so I could send another one.

Well, the good thing is that the participation rate has improved from about 60% in round 1 to about 90% or better now. When several people dropped out after round one I assumed they were non-participants, but every one of them had sent cards in round one. Conversely, several who didn't send cards in round one continued to sign up for later rounds.