Unfortunately Metroid has never been as big a seller as Mario, Zelda, Donkey Kong, Pokemon, etc....so that's why despite it being a 30+ year old franchise that began in 1986 it doesn't have as many games as the other Nintendo franchises.
Nintendo generally keeps Metroid alive out of goodwill to hardcore Nintendo fans. It's a shame the Metroid Prime games didn't sell as well as they could of, Metroid Prime 1 only sold over 2 million and that's it, but again they were stuck on the Gamecube for awhile. Even Metroid Prime 3 on Wii didn't sell more than 1 million.
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