I'm certainly not the best photographer on the planet but I've still had a photo lifted and claimed as someone else's. I've also seen a friend's vacation bathing suit photos used on a dating site once without her consent. FYI, she never posted those for general viewing. She had uploaded them onto an online photo storage site so she could get prints made for her guy and some for herself but that was it. All those photos of her in her skimpy swimsuit somehow they made their way onto that dating site and she was very upset to see that.
That's unfortunate that happened. But why would she watermark photos intended for print anyways? This is more of an issue with the security of the online storage site and watermarking wouldn't be applicable here.
I don't care if it's my worst photo ever. It's still MINE and I want to choose where it's used and I want credit for it. A good watermark can often be the difference between the photo remaining your own or ending up on someone's facebook page without permission these days. It's only common sense to use one, IMHO.
If someone really wants to steal your photo, they will whether it's watermarked or not. They can:
1. crop it out
2. remove it using the clone/healing brush tools in Photoshop CS4
3. quickly remove it with content aware fill in Photoshop CS5 (in about 10 sec.)
4. or not care and take it anyways
5. some people disable the right mouse button and thus disable the 'save as' command for Windows, but Mac users can just drag the image off and Windows users can get screen capture freeware to get around this (Mac has screen capture built in to the OS too).
If you are worried about people using your images, then don't post them to the internet. Or if you size your images at about 500 pixels on the longest side, a good looking print could never be made from them.
But a watermark is not going to stop that many people and it ends up looking gaudy and pretentious. If you find someone using your image, screen capture all the uses you can find of that image and then send them a cease and desist email. If you images have commercial potential, get them electronically registered with the copyright office for added protection.
But seriously, and no offense, I've never seen any of your images and I'm not commenting on you at all, watermarks look ridiculous if they images are not polished themselves and reflects poorly on the image maker. It's like when you see the delusional people on American Idol tryouts.