Considering how easy it is to crop or clone out text like that I don't even see the benefit in polluting your images with it. Use a digital watermark, register your images, etc if you want to protect the low res resolution images that are the only ones you should allow out on public sites anyway.
If you strew a bunch of images about the net it is nice to have your name somewhere on the pic so someone can get a hold of you to obtain rights to that image if someone ever has the want, need, or ambition to do so. I would prefer an unobtrusive sig myself. I do try to keep my smallish sigs pretty uniform on my pics.
Watermarking with digimarc is a very expensive annual proposition for me and anyone else that has many images on-line but does not generate a huge revenue with them. Digimarc can be simply unaffordable. However, I do still embed a digimarc id into all of my images, I just don't pay for the digimarc regestration/search capabilities. If I see one of my images on line and the name is gone, more than likely the watermark is still there. Don't forget that embedding a watermark degrades the image quality by colour shifting. A heavy watermark really messes low res images up. I almost always just use the the lowest/worst security settings when I embed my watermarks. Of course the best way to detur commercial pirating is just keep the images small and low rez. Registering your photos never hurts either, but your photos are still your copyright/property even without registration.
Some wide/good exposure with a solid and or compelling pic with your name on it is also a pretty cheap and effective advertisement/marketing ploy. I do somewhat agree with you though, that a sig, especially a large one, on a straight photo does turn some people off. It's like...what are you showing, the photo, or your name??...
Regards