[Christopher Colley]

which suggested that members be entitled to participate in certain exchanges ... but not others, as a means of encouraging subscription, without discouraging participation

Matt

I read the responses but I didnt understand them in the way you described it, YES, this does make sense to me. Give someone the chance to experience an exchange (such as the blind exchange, or another smaller one) without risking loss of participation of well meaning users due to lack of participation ("deadbeats") in exchanges that have large amounts of prints.