By Alvin:
"Don't tell me it's bought by a collector who has everything but just miss this one. Impossible. Collectors start from common variations, going scarce and rare domain gradually. Not the other way around."
Some collectors do start at the top - and only collect the top variations!
But more likely this one is an example of "auction fever" , or the "collector" has a Red 9 with serial on either side of this one- and will have consecutive pair; or collects junkers.
I can think of many silly reasons, but the most like is "stupidity".