Pulling advertising can be an incredibly powerful tool to get things in motion. This is the largest BTC forum from what i understand and clearly to this point the admins have seen no reason to stop advertising BFL on the site. However, if this site did not allow BFL to advertise, their exposure would decline fairly dramatically, especially to newbs (who come to forums first to learn as much as possible about a new venture and can be especially vulnerable to too-good-to-be-true offers). So, if you want a company to respond and get the gears turning, you remove their public exposure until they can absolutely assure they're not a scam. I realize forums usually solely survive off of ad dollars so the likelihood of this happening is little to none but nevertheless its a thought.