Thanks!
Maybe attorneys, for discovered documents? Accounting? Or historical research? Some authors prefer to write in longhand . . .
Do scanning companies ever outsource manual jobs?
For consumers, how about family histories or recipes? [There are companies which create family cookbooks, for example.]
I think the site copy is like a first draft in its current state--a good start, but could be shorter and punchier (copywriting's hard). Find out what people are searching for in your niche and weave more keyphrases into the text.
I also suggest working on the text layout to better distinguish your points. I consider the remainder "good enough," with the possible exception of the logo. But selling is more important--clearly and briefly explain what you're selling and present a call to action (maybe make the "Go" action clearer).
Good luck!
Along those lines, consider charging per line transcribed rather than per page. Customers with short documents might balk at the price when they don't need a full page transcribed. And using a standard transcription character width means that you'll have more granular data.
And if you don't already have a terms of service (I didn't delve deep into your site, but didn't see it readily obvious) you need one that informs the user that the final documents are not guaranteed perfect and have some agreement that will relieve you from the liability if the user doesn't review their own document before using it in a professional capacity. A minimal error in a legal or medical document that isn't reviewed could have costly implications.
Lastly, two nitpicks: 1) you have the word "transcriber" on the landing page, but "transcriptionist" is the more common term for the occupation (e.g. medical transcriptionist) 2) The "Go" link in the header and footer isn't descriptive. Why not have a link that says "Transcribe" or something more readily meaningful than "Go"?
Sounds like a nice idea, you may need more stringent rules on what constitutes a "page" though.