Retired educator. I favor science flavored non-fiction. I self published 4 small gambling books in the 1980's and sold about 20,000, mostly to gambling book retailers.
I'm a bit of a political junkie and follow politics too closely for personal comfort.
When I retired, I sold books on eBay for about four years. Too many others got involved, and the compitition drove prices way down as the auction element was diluted by multiple copies for sale.
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