When is the last time you received a voicemail from an ad representative looking to sell you ad space in an upcoming publication? What about the call volume associated with any sort of press coverage or mention you received in that publication? That number is probably much higher, with the ad rep telling you how ideal it would be to place your ad close to your editorial to increase the overall impact for your company/product. Another school of thought is that when ads run in association with editorial, they lessen, if not completely destroy, the credibility that might have been gained with "independent" editorial. Ads are paid for, editorial is generally perceived (unless you a PR cynic) as not – the two don’t mix.
Why not, enjoy the reward of an editorial mention on its own and perhaps follow-up in a new issue with an ad? Just some food for thought…