Personally, I would probably pay someone at least $40-50/hr if they really knew what they were talking about. Unfortunately, most are college kids (or just out of college). I ask them what they won, are they a champion?
The answer they give me is all the tests they have passed, which I know are hard but it is still not real world.
I think you need to posess the following:
1) Face it, you have to be physically attractive and have a great physique.
2) Your credential have to be more than text books, what have you won? I want someone who knows what it takes personally.
3) You need coaching and motivation skills, along with being very personable.
4) You need someone supporting you financially at first...rich daddy, a working spouse, etc.
5) Be able to accept frustration, because most people won't stick to the program you give them. Most of the people are not going to be athletes seeking your advice, but instead lazy, fat people looking for the quick fix.
Honestly, I think there could be money in it. But if you truly had those 5 aforementioned qualities, you would make more money in Sells/Marketing. The people I know who do it, are women with a rich husband or they are like "animal b", they have dedicated themselves to the health field doing other things like chiropractics, nutrionist, a coach, etc.
Sorry, but that is the reality.