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It's real. Though I'm not sure how to prove it to you in a way you would believe. Want to see a screenshot of my Gumroad account showing $75,000 in book sales? Oh wait, I've already included that in my posts.

What evidence do you have for that allegation? Regardless, your tone isn't even remotely constructive; you should back that off a bit.

Proof?

You've to ask him for that, not me!