Thank you for your comments as all feedback is helpful to me in understanding other writers’ points of view.
I was Assistant Director of Creative Writing at Oxford University, and was also Literature Development Officer for The Arts Council of England.
I have a Creative Writing MA from the University of East Anglia, having studied with the late Malcolm Bradbury and Whitbread winner, Rose Tremain. I am also founder of Oxford Literary Consultancy.
In short, I have worked with some of the world's most famous and successful authors over the past 20 years.
I understand your scepticism, but note that none of you have attended any of my publishing seminars. So I suggest you contact me direct for a complimentary seminar ticket or a 1:1 mentoring session. You can then decide first-hand whether I am a person of integrity and whether I can help you achieve your publishing goals.
Regarding the figures on book sales and writers' incomes, these are taken from research by Nielsen BookScan and The Society of Authors.
The speakers (including myself) have literary agents and mainstream publishers - namely Hay House, Robert Hale Ltd, Aufbau Verlag, and Wiley Publishers - though some are self-published.
(Personally, I do not define a person’s success by whether they have a mainstream publishing deal but by whether they achieve their own personal goals - whether selling lots of books, winning literary awards, getting a film option, etc.)
These facts were all included in the sales page you were referring to. I hope this will allay some of your scepticism.
Wishing you every success with achieving your publishing goals.