No one is saying you shouldn't do the things you mentioned. If that's the way you want to run your business, fine. We are just saying the government doesn't require it by law. There is no law that says "If you sell your commercial footage, these are the things you need to do:" The government doesn't not explicitly prohibit what you mentioned.
On top of that, even with the references you make with regard to part 107 and commercial activities, if you make that stretch, fine. However, please limit it to just the video that you took when you performed the "commercial" work. It doesn't apply to the millions and millions of videos everyone else recorded and captured not knowing their intent especially if they flew their drone intending only to have fun. It's almost as if you are saying drone footage that was captured without a part 107 cannot ever be sold.
I think you're being a bit disingenuous with your pronouncements specifically about drone footage being regulated by the FAA in a way that is different from basically everything else in the world. Americans value freedom and we don't like licenses and permits so we limit that to ONLY what the government has control over; nothing more. It's almost as if you are carving out special circumstances in a sort of "privileged" way meaning only people with part 107 can sell drone footage, ever; period and no one can do it legally. Well my friend, there's something called the First Amendment of the Constitution of the United States, are you familiar with it?