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Can someone explain what exactly is chess informant is and why its cost so much ?

I know very little about Chess Informant nowadays, but did purchase a few many years ago, starting with number 10. I believe the Yugoslav GM Matanovich started the series. It was truly an international publication, the first to my knowledge to use figurine algebraic notation.
In those days, it was published twice a year and included all games from major and even fairly minor events of international interest. There might be 700 or 800 games, some lightly annotated with universal symbols, grouped by ECO code. The primary importance as far as I could see was for keeping up with opening theory.

Books take a while to write. Magazines don't have room for all the games that have been played. The purpose of Chess Informant is to hold just about every chess game played anywhere in any notable tournament, so that if any new move is found in any of the openings, you'll know about it.
It's the sort of thing active Grandmasters subscribe to.
I mean all I know about it is apparently it contains games with commentary and it cost so much.
Why is it so popular? Why cost so much ? And most importantly why not just buy chess book if you want quality authors or games commentary etc... what's wrong with books? Why informant?