I would have to agree with this.
I'm amazed at the number of print orders I get from some clients who already know I'm supplying all the image files on disk. If people want to be sneaky they will be.
I'm also amazed at the poor quality people are happy with - I received a photobox thank you card from a client with one of my photos on the front. Max available size on my website is something like 800px on the longest edge (for sharing on here and other forums). I have a small watermark in bottom left which they also cropped out. The quality was poor but the image could easily be interpreted.
I do have one question though; you see big brands (non-photography) chasing infringement on the grounds that to protect their brand they need to be seen to be protecting it - does this apply to photographic works as well? (Or am I getting confused between copywrite and trademarks?).
Perhaps I should be caring - regardless of price - on principle?