Simply put, merb accepts advertising from all agencies regardless of their honesty. There are agencies that advertise on merb that are active B&S agencies, posting fake/stolen pictures on their website. Merb's policy is to accept their advertising provided that their posts on merb contain only accurate pictures.
I personally feel that accepting ads from agencies that have flagrantly bogus websites, regardless of their posts here on merb, damages merb's credibility. I also think that, whenever possible, merb owes it to the membership to protect them from dishonest operators. Note, that I'm not suggesting that merb police the internet, but that merb should be proactive whenever a member aware of a violation.
To present the other side of the story, here's mod 12's take on the issue from another recent thread. "What an agency wants to do outside of MERB is their own business. We do not monitor them or police their personal websites. They have the right to run their businesses the way they choose. What we are concerned about is that the content on MERB is genuine and pictures are not B&S. We moderators only have powers with respect to this domain and try to do what is best for our members within that realm. We don't approve of disingenuous websites, but as long as what is presented to members On this board, is genuine, we are happy. That's the best we can do, sorry."
A third possibility would be to continue to accept ads as long as their is no link the the agency's website.