The key parameter for swap size is "how memory-hungry things you want to run", which isn't easy to measure, but paying for installed RAM is a somewhat usable proxy metric for that. If you were happy with 8gb, it's some evidence that your apps don't need much memory (and swap), but if you needed to pay for an upgrade to 32gb, that's some evidence that you're the kind of user who needs much more swap than those with 8gb of RAM.
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