So, should I assume that the reputations of this whole forum, as well as of it's posters, are questionable reputations, just because there are advertisements in each and every page?
Absolutely.
And as a user of the forum, you should pressure the owner to remove those advertisements that you feel are for questionable services.
If the owner of the forum refuses to remove advertisements that you find to be of questionable nature, you should refuse to participate, and should either find another forum or start your own.
So. Let's see how many of us will do as you have said...
If no one does, I will also start deducting credibility points from everyone participating here....
... well, on deducting everyone's points, won't it be a draw anyway?

