Recommendations

[Bookreader1972]

I doubt I am alone in thinking that the computer algorithm amazon uses to make book recommendations is got to be the stupidest algorithm ever.
Two of my recommendations today, based on my read shelf were
"Shout It Out Loud: The Story of Kiss's Destroyer and the Making of an American Icon by James Campion* &The Last Outlaw by Stan Hansen a retired Pro Wrestler's autobiography.
Both were based on the fact i read Richard Castle High Heat, the 8th book in the based on the tv show book series.
Where is the relationship between these books????
What could any computer program possible believe the three book have anything in common?

All comments welcomed