If the constant "Selling were going on in the Yahoo group, the person doing so would be placed on moderated status until either the sales pitches stopped or the user was banned.
Here on the forum we have other options..
There are icons on the left of the time date stamp on each post
Not sure if you guys see them all but the reputation and report post icons you should available to all.
Infractions can be given for the following
Infraction Level, Title Points, Expires, Warning
Inappropriate Language, 1, 10 Day(s)
Insulted Other Member(s), 1, 10 Day(s)
Signature Rule Violation, 1, 10 Day(s)
Spammed Advertisements, 1, 10 Day(s)
Insta-Ban, 20, Never
Please use these icons and remember, reputations can be marked as good also.
(It's gonna be a looong winter