Invention Idea

ever think you may have an innovative idea that you could make millions off of. I was at the beach this summer on a windy day when i noticed how many people have a tough time putting there blanket down. How many times have you had to put sandals or rocks on the corner of the blanket?? I thought that making a beach blanket with wieghted corners would be a great idea. SO i did the research of how to go about doing so only to find out that there are multiple patents already out for this idea : (