Why aren't your prices published?
In short: Not yet. Each engagement is quoted individually by email with its basis stated (per report, per item, per box or per hour), so you always see the exact number before you agree.
The practice is young, and the right price for a thirty-card collection with three graded slabs is different from the right price for one raw card. Rather than publish a number that fits nobody, I quote each job in writing.
What is published is the basis for every service, on the pricing page. That tells you how the quote will be built, and the rule that it will never be a percentage of value. When standard prices are published, they will appear there.