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As far as supporting creators (or rather rights holders) goes, whether you pirate, buy a used copy or use a library makes absolutely no difference.

Very true. It's more of a personal choice based on my own values for myself:

If I buy secondhand, I still provide value to someone (the used books store, etc). There is an "equivalent exchange".

You also funnel money back to the person who bought the media in the first place, and they might use the money to buy more media.