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"I like to preorder my groceries. I know they're going to have what I want, they always do, but I just give them a few hundred in advance to make sure they'll still have some when I get there."
Same logic.
Let me introduce you to the concept of a supermarket Christmas savings club. You basically pre-order Christmas groceries with them.
https://metro.co.uk/2023/09/18/supermarket-christmas-saving-schemes-tesco-asda-19514484/
Of course the joke is that, when pre-ordering games, they don't usually deliver what they promise. With pre-ordering Christmas groceries, Tesco will.
Tesco probably will but plenty of Christmas club companies have gone bust and left people without their order. Even companies as big as Tesco can get in a mess, it's not like they hold the stock for you in advance.