If costs are a consideration, participants can be asked to pay for a set of "interaction stamps". This method may also provide a way of distinguishing between participants permitted to interact (e.g."full members") and those who are not (e.g. "observers"), or to ensure that their messages go into separate Bulletins. It may also be used to limit the possible number of written messages from different categories of participant.
See also Abuse / Misuse of Messaging / E1.
How consumption starts? You just bought a beautiful dress and then you need new shoes; now your old handbag is not good enough and your old coat is out of style, so you have to buy a new hat, new gloves, new car, new business club membership and soon ... be careful of having any material desires. Long live the people who live in the world of the spirit. Ege Hirv, "Roots of the Future", Paris, 1991.