Hi Jake,
Publicity is certainly a good thing when it's a postive story, but a story titled, "I wish I used a buyers agent", isn't a positive story.
It could very easily be perceived as a wealthy investor, taking advantage of negative gearing at the cost of the poor tax payer, is moaning that they thought property prices were too high and thus failed at auction. You just need to look at the vast majority of comments to property articles published on The Age's website to know that the general public isn't going to be behind the investor.
When Nathan appears in the paper or on TV, he's talking about his successes, not failures. From the investors point of view, an article about wishing they used a buyers agent probably won't be written as a success story for the investor.
My suggestion would be to submit an article about some of the great results your clients have had, especially over time. Perhaps, "Jake helped us buy 12 months ago for $x, and last weekend the same house next door sold at auction for $x + $y. We're really glad we used a buyers agent!"