I have a friend asking me that exact question some time ago and that's basically what I responded to her, but your post is way more complete !
I have a great exemple. If you talk about a Picasso painting, people made replicas, they are worth way less than the original. I mean, I'm sure you can buy some paintings at IKEA that have been just printed and that would cost only $10, the price of the materials
RE: Can I take a screenshot of the NFT image and save it?