The challenge for (... Singer? ) will be to make the story interesting enough for a very wide audience.
I think the cheating in the name of charity aspect is compelling enough to interest a wider audience, if that's the route the article takes.
Though, I think simply investigating what would compel an individual that - at least externally - appears a model citizen to cheat in such an elaborate and expansive way is compelling enough. If this article isn't about raising money for a sick child at all costs (or some other critical need spin), there's a lot to explore with coping with middle-age, community image, personal, social, or family expectancies, psychological disease, or something that began harmless enough but spun out of control. For all we know, this began in a similar fashion as the Seinfeld where George wears the hiking boots, appears a few inches taller, then never takes them off to keep up first impressions.
Whether it be marathons or Chutes and Ladders, competition and the degree to which some will go to win can be quite a story.
I read this thread as a runner, fascinated by the how, but this pending article should shed some light on the why, which should be equally - if not more fascinating.