Well that ones easy because the background color is all the same and it's easy to copy that grayish color and cover it. But if आप tried to remove a picture like this one it'd be kind of difficult because there are multiple रंग where the water mark is.
Yeah, watermarks annoy the living daylights out of me, especially when they are running across the picture. It doesn't look nice but it isn't fair to remove them. Did आप know that those websites actually pay for the high resolution pictures? I'm talking about the professional galleries King of Dancefloor, MJPhotoscollectors, MJJPictures, etc.
They pay real money for those pictures and give them out for free to the Michael Jackson community. All they want back is credit for the image.