sorry but I have to say your 100% wrong here... people steal images ALL THE TIME...
example number 1
just a few months ago we were introduced on the forum to some guy named justin, who had created a site for HIS images taken of hurricane katrina, among other things as well.. and he claimed that he was trying to raise money for victims through the selling of HIS images... right away we all caught on to it being a scam... and then some savvy TPF people did some research on all the pictures, and found out that EVERY SINGLE ONE was stolen from other people... how could they have avoided having their images stolen??? big nasty watermarks that are hard to remove....
example number 2
there is a local photographer in my area who runs a business, does weddings, portraits, children, pets, you name it, she seems to do it... however, about 6 months ago, another photographer friend of mine noticed that some of her pictures were being displayed on this photographers site, claiming them as her own...
people steal images all the time, so its best to protect yourself.
i used photoshop, and the EMBOSS filter... and i also dropped the opacity down to around 10% or so so it became see through