Having one 'main' natural fed, like IFBB is for unnaturals, couldn't hurt. Maybe there's one already, I dunno. But it would help shift the focus solely on one thing, and people can concentrate on that fed, its contests and competitors; like how we all talk about the IFBB over any other unnatural fed.
As for size of the competitors, you really get a mixed bag at natural shows. From the under 21's Average Joe physique to the top guys worthy of the NPC. I'm sure most people would only want to see the big guys. In the IFBB, they're ALL big guys! So you get your money's worth there. Just one reason why untested shows are ruling over natural shows.
Like I've said before, get one main natural division, like the IFBB, and promote the heck out of it. Get a magazine, 3 or 4 shows a year, get your marketable guys doing the marketing side of things and just put the eggs in one basket for a while. You need to draw attention to things before people can become aware of it.