I don't actually go around counting who is driven away.
However, it took all of 5 seconds to figure out that Fountainhall seems to be posting his excellent material on a different forum now. One of his posts would contain more of interest than a thousand written by some people.
Anyway, you're also trying to fork the argument into 2 separate issues. Kicking out the spammers who NEVER write anything worth reading is one matter. Cannot happen fast enough in my view.
Pissing off people who do add something is a completely different issue, if it happens. Let's not confuse the two.