Paying for a ticket isn’t the same thing and I’d argue that’s not morally justified piracy. You went from a rental to ownership at a rental price.
I thought you were going to say something like “I already bought a copy of Star Wars thirty years ago, then THEY made the way I watch it obsolete, so I don’t feel as bad getting another copy since I already paid for it once.”
That would be closer to moral than “well I watched it in the theaters once, so I totally own a copy!”