The problem with this is your one idea could be your "wave" to success. Not to say there wont be any other great ideas but if you can create it first, regardless of competition its something for your resume that people respect. This wave could help fund an even better idea. I know HN is built on sharing ideas and I think thats great but unfortunately HN is not the world we live in. The world we live in is filled with thiefs and liars. Im in the same boat and I keep my startup right now pretty tight. I tell lots of people but only people I trust. Hope this helps