I completely understand everything, however there are other issues to consider. The first is that many of us just don't care. I am not a professional, not even close, so I am actually flattered if someone uses my work for something. Hopefully it means they enjoyed it and I don't care if I am compensated. I seriously doubt that anything I make would ever be used on a commercial level anyway so most likely there is not any money to be had anyway.

Remember some of the most valuable paintings in the world today came from artists that were all but unknown in their time and were not usually compensated well for their works. The term "Starving Artist" is very true and pretty universally known. Not that their work doesn't have value, it is just the reality of the world. Most artists do it for their passion, money would be nice, but do it because they feel the need to express themselves through their media.

The other issue is that watermarks just plain suck. It makes it imposable to fully enjoy what the artist is trying to show in their photo or video. It also makes it very frustrating and annoying to the audience as it takes their focus away from the subject.

Watermarking is also not the most difficult thing to remove using Photoshop or a similar tool. It does not guarantee that your work won't be used and will not necessarily hold up in court if it came to that.

So I say, what is more important to you as an artist, sharing your work with others or preventing it from being used commercially? Unfortunately it seems as you really can only have one or the other.

I hope my being forthright didn't offend you as that was not my intention. I was only trying to give you a view from my perspective.