I literally LOL'd at this part. Do you honestly think that UK retail buyers actually give a shit about this. Promotion via MCV is a small part of an overall campaign. Nobody is dropping orders because the "wrong" journo wrote the recommended piece
I imagine retail buyers are expecting to be getting non biased recommendations on what would be in demand products to stock for their store's customers.
If those recommendations are made not on the merits of the product but on other criteria of the journalist due to an existing relationship s/he has with the publisher of those products, this then calls into question the worth of other recommendations by the journalist and the magazine itself that seems content for this conflict of interest to continue.
If I were a retail buyer, would I continue to take the recommendations from this outlet into account? Probably not.
If promotions in this trade magazine have less impact, it stands to reason that ad rates would drop. No business wants to continue spending on ineffective advertising methods.
The advertisers are spending significant amounts of money and this decision wouldn't be taking lightly as an emotional knee jerk reaction. Any company worth its salt with a decent advertising budget at hand should be tracking the effectiveness of any advertising campaigns and have metrics already in place for this. If these metrics are showing that this particular publication is becoming less effective then why would they continue to advertise?
With your earlier reply, I think you've missed the big picture. Some companies don't care if the publications are using underhand tactics to promote their product. They just want to know that their ad spend is effective. If information comes to light that impacts the effectiveness of their ad spend in this instance, do you really think they'll stick around or at least try to negotiate lower ad rates?