Please vet my startup idea -- IdeaScreen

Here is the idea: a service that validates people's start up ideas (...meta, I know) by doing the hard work of finding individuals in the entrepreneur-to-be's target audience and talking to these people via phone calls, DMs, emails, etc to determine the collective "willingness to pay" for the start-up idea.

The exact offer is finding the willingness to pay for X idea from 50 ideal target customers in 2 weeks with a final report summarizing findings.

For example, Sammy goes to IdeaScreen's website and purchases the "(Standard) Business idea validation" tier. After an initial phone call to collect information about Sammy's idea, including a product feature list and the profile of the ideal customer, myself and a team of people spend 2 weeks getting data on the "willingness to pay" from at least 50 people for Sammy's idea and deliver a report at the end of those two weeks with a "go/no-go" recommendation and at what price for Sammy, based on the data. All records of conversations had are delivered to Sammy with the final report.

My questions:

1. At what price would you find this to be a bargain? and why?
2. At what price would you consider this to be expensive? and why?
3. At what price would you consider this to be prohibitively expensive?

Thank you!