What's with Over-Priced Chess Books?

 5/3/19- OK, I like Spassky, both as a player and as a person, but look at this!

Really? Spassky's best games, for $371?????

Here is another one (this one I own- I probably paid $30 for it)......

Wow.....

Another one....I mean, Kortchnoi is good, but.....

Maybe it's just me....I don't get it. Either there are some really desperate sellers, or the Amazon algorithm is just nuts.

Just sayin'!