You will have to take my word that when an established member (or trader) crosses the "line" team members go out of their way by way of pms and word of mouth to encourage them back off before formal warnings/temp & permanent bans are issued, so they do have time to prepare for their departure. Of course, on the rare occasion when someone has said/done something that could put the forum's reputation or legal position at risk, or they have been so abusive an immediate ban is necessary, then tough!
What is helpful is when you guys report rogue/bad posts - that include those from scammers/timewaster who often post when we are trying to get some shut-eye. I've lost count, during my time as a mod, of the hundreds of these we have banned and many who you guys do not see at all wanting to show us their porn etc (we have to keep some things for ourselves ) or think they can come on and trade for free and when offered the chance to signup and don't and then find their time on here is short-lived.