You are also free to choose a fund that is based on any index that you want. For example, there are index funds set up for just about every market sector there is — energy, precious metals, banking, emerging markets — you name it. All you have to do is decide that you want to participate, then contribute money and sit back and relax. Your stock portfolio will then be on automatic pilot.
Frankly, I do not care whether there is a site on the same topic as one I’m building. My most profitable website is a photography website. Not any specific niche of photography. Just photography in general. Guess what? I wasn’t the first photography site. There are hundreds of thousands of sites about photography! It really doesn’t matter. Even if someone else has a “better” site than mine, some people will identify with me, like the way I write better than other sites, will find my site first, etc. You don’t have to be the only one in a niche to make a site work. Not at all! In fact, I have had more success building sites in busy niches than in empty ones. The fact that people are there means there are potential customers and visitors there.