I agree that the price is high from an on-looker's perspective. Keep in mind that to write a quality whitepaper, it takes about 4 - 6 weeks of intense research, consultations with developer(s) and domain experts, and a review by a technical expert. The price is right for this kind of work. However, I can see that trust becomes an issue (potential idea here). Problem is, I am not an agency, and I am working freelance. In today's crypto/ ICO world, I simply cannot share prior work. However, I can privately share my prior work with clients who I've agreed to work with in the future. I can offer an initial 'Whitepaper Outline' for 0.5 BTC, which would give an overview of what's possible, and how it would be accomplished.