Here's from one of the guilty ones! Here's the "psychology involved."
I own webspace for something else. I wanted my own website name for my photography blog and domain names are cheap. My name is Ivor, my hobby is photography and so the website name is ivorphotography.co.uk. It's easy to remember if I am telling anyone who wants to take a look at my snaps. (I don't have or want business cards.) If I were a stamp collector my website would probably be ivorphilaterly and ivorcamponolgy if i were a bell ringer.
I have no intention of being a professional, I take photos for fun and to share with a few friends using social media such as Google+ and Facebook and as part of a challenge through another forum.
I went through a short spell of watermarking my online pictures because of a heightened awareness of images being borrowed without permission. But I stopped because I realised it would be easy enough to remove it again. Also, the watermark detracted from the image and it would not deter a thief. Actually, if anyone thought an image of mine was worth using it would be a kind of compliment! It has happened to me, the person wasn't making money from using it, I didn't object. (I can hear the gasps of horror!)
Ivor