Ever since the runes rework a couple of seasons ago, I feel like there's no need to have plenty of organized rune pages. You have the option to edit them during CS and from what I know, a lot of people use third party programs such as Porofessor, Blitz etc. to get recommended runes set for each champion. This only requires a single rune page that adapts everytime you lock in a champion. https://showbox.bio/ https://tutuapp.uno/ https://vidmate.cool/
Before the rework, you had to edit your rune pages before you queued for a game since it wasn't an available feature when you entered CS. I'm just failing to see the reason why Riot till this day is charging 6300BE for a single rune page.