Individuals who pirate my books are also more likely to buy them in the future.
Piracy is just about accessibility and trust. If the person can't afford to take a chance, they pirate. And if you win them there, they'll buy.
(Nit: Zero of that applies to corps. Thanks Anthropic, Meta, and everyone else.)
It would be interesting to see at what point of notoriety that is no longer true. Like is this still a factor for Stephen King, or at that point is it really just lost sales?
As for scale... There is only a tiny fraction of the industry that can support their life on writer's income, let alone be a household name.
It probably does become just lost sales at that point, but to reach that, you're probably already beyond most competitive forces, leaving only piracy around.