I remember enormous controversy at the time about modem manufacturers who would sell you a high speed (for the time) modem for free or a substantial discount if you put a little advertisement for their modem on your board and it was NOT well received. I think this was around the era of dueling and completely incompatible 9600 baud modems. I skipped that horrible era and went right from 2400 to 14400 then rapidly to 28800.
Class based access levels were a thing in the BBS era. It seems hard to believe in 2016 web page world where there's maybe "have an account vs no account" or at most "guest/free/paid" but some BBSes had a zillion levels of participation and allowed time and ratio requirements. Some got a little eye roll-y over specific.
Active discouragement of lurking, is how I'd phrase it.