I think that price is a typo. After the publisher opted to not
offer a U.S. edition, I purchased a small supply of paperback copies for friends, et al. The remainder have been going for $19.95 (in the U.S.).
In any case, no, I do not share in any sales via amazon.com or other outlets. FYI, WW I aviation history is a "niche market" and any writer/resarcher looking to make bundles of money should write about vampires or whatever the current "hot" topic is.
As for me, I am now retired and do what I want
to do, vs. what someone else (the "boss" in various forms) wants me to do. I like it this way and hope I can keep at it for a l-o-n-g time.