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I wrote a book on Google Authority 2 years back and after steadily growing in sales it gives about 800USD/month now:

Although I haven't spent a single penny on promotion and selling it for less than I should I guess.

Can I make a suggestion - try a month at $29 and see what happens? If it doesn't work out change it back.

Always experiment with pricing. It's easy to misprice ewares optimally by a magnitude of 2.

in which direction ?