I would say this falls apart when it gets to physical copies. Used sales, trading, borrowing, watching/playing together, recap videos or long-form reviews etc all can "deprive" value from seller's immediate perspective (also for some things: DIY, clone recipes, dumpster diving etc). Also I don't expect a company to have even the ability to determine if a downloader has ownership (especially if the only record is a physical receipt) before firing legal scares at people. It is even more pointless when a product is past its original life cycle.

Fresh in the box office and before ROI sure, I can see a point (say for the source of a cam rip). But I could also see reviews or comments, spoilers etc to possibly have a greater effect than the cost of 1 ticket.

Either way I'd say if people have the ability to pay, they will if the product is good and the company/service is respectable. That's the point here, that paying customers are ultimately screwed over (just as I'm sure most employees/creators not at the very top were, because money). Also unsatisfied customers, lack of demos, lack of agreeable purchase methods/terms (also, too much splitting with subscriptions), lack of ability to give more direct support to creators (rather than publishers) etc.

That and I don't think the government should do much to protect the profits of highly successful entertainment companies who have massive budgets on lackluster ideas and underbaked products. The news of being able to trash a nearly-complete movie for a tax writeoff is terrible, for instance.