I notice most of the startups face the following problems during my advisory in incubation:

1. Non-Clarity on the product & its need
2. right pricing and costing estimations
3. not estimating working capital requirements
4. making very optimistic assumptions
5. plunge with emotion than factual forecast
6. not verifying the feasibility of the business idea
7. over estimating management ability of self
8. not getting the right skillful team on board

I believe an independent sounding board would help to resolve most of the challenges. while saying all this, it is also proper to say that only promoters of start-up will have have the vision to build his venture.