How about modifying the bot so that it publish a list of authenticated and non-authenticated users currently in the channel once in a while? That would at least help to get an quick look of how to trade with.
What about making those chans accessible only by authed users? What would be the downside to that?
Anyway, following safe trading practices will not have you scammed most of the time. But I don't think any screaming teenagers would be allowed on any stock trading floor..