The internet can be a very scary place and the reasons you can think of to block your license plate are probably not even the reasons people would take them. I'd rather limit the information I provide anywhere on the internet because it isn't just the people on this site that have access to it. There are web crawlers and all sorts of other ways people find images. Go to Google and type anything into the image search, you would be surprised how many people's personal pictures (vacations, etc) are found. And they NEVER go away.