This is the essential question. I think that people would happily pay for it if you are an established, recognised brand.

As with everything in life, there are plenty of issues you will face. One of the more specific ones being the fact that every company interviews differently. Whilst the basic structure may be familiar, what an employer is looking for from the candidate could be drastically different from what you personally look for. You can counteract this by utilising the services of a top recruiter who specialises in your industry (cough cough...hint hint) as they could potentially educate you on how other companies approach their hiring process.