What Niche is the Most Marketable?

What niche is the most marketable? This is a question that I am trying to find out through experimentation. I have been doing experiments lately using new domains and taking advantage of my we host which provides unlimited add-on domains. I am trying to venture into passive income.

Passive income, meaning, trying to increase my income through ads on my sites by increasing the amount of traffic it receives. I was able to increase my income just a little bit, not enough to resign and retire, but enough to augment a part of lost income as online opportunities decreased. Continue reading