I think the service could be quite valuable for some people. That being said, I do not think that I would use the service. I've been cycling for 30 years and am comfortable shopping for a bike because I know what to look for. But bike shopping and fitting can be daunting for newcomers, so I think there would definitely be takers.

I did pay for a fitting once. It was $100 and very comprehensive, and it was 10 years ago. Your prices seem fair (assuming it's not $200 per hour--but for the whole package, right?) Are there bikeshops in your area that provide fittings when you purchase a bike from them? That might be some competition, or perhaps you could work with such a bike shop.

Best wishes for much success on this.