I'm way more interested in what potential users think of the idea.
To be quite honest, I don't even care what a business type person wearing a suit has to say about my projects/ideas. I'm also highly skeptical about so called "Market experts".
Perhaps you might want to consider arranging your idea so that you take the money from VCs in exchange for meeting potential startup founders.
Why pay some bozo to give me feedback when I can have my customers, people who actually use my app and are passionate about the problem.
I'd rather use the money to make some landing pages and drive traffic to collect emails.
Not after few months where you have invested time and money. Will you pay for it? Or not still?
If I can't figure out how to put together an MVP, then I'm looking at a different style of business where I want people with the sort of knowledge you're talking about either in the company or in my social circle, and a one-time consultation wouldn't be nearly enough.
Something to bear in mind is that an idea on its own is fundamentally worthless. A report of the type you're talking about would not add value in the way an MVP would.
Will not be a simple reading of the idea. You buy an hour of the reviewer's time to judge your idea.
Shameless pitch:
We, at StartUpLift.com, are trying to build a very cost-effective (and often free) way of letting startups get feedback from users. Here are some examples of some great feedback received by offering small incentives to top feedback providers: [Ninja Post - Offered $5 each to top 3 feedback providers]: http://startuplift.com/ninja-post-forum-software-for-a-web-2... [Tom's planner - Offered $5 each to top 10 feedback providers]: http://startuplift.com/toms-planner-surprisingly-easy-projec...