Why do you stockpile diapers?

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This is a genuine question, not being snarky. I'm curious what people's reasons are for stockpiling diapers. I did it for my first and his skin ended up being super sensitive so I had to return a TON which ended up being more of a pain than to just buy them as we go. Is it for financial reasons? Or some people just aren't picky about what brand they get? I've noticed a lot of people just buy tons of different brands!