Develop and then what: earn ppc income? I think it is very difficult to make profit from ppc in the past 5-10 years. Amazon. Google, Facebook seem to be getting most of the money on internet. They don't need to share it with little guys. In early days Google would track people using adsense, but now they can track with analytics and chrome; adsense not needed. Other ppc services seem to be totally corrupt as well. (I'm not sure about all these, so correct me if I'm wrong.)
But if it is a topic you like you can create a web site, without hoping to make money from it. If you do, it is a bonus. Personally I wouldn't develop an .io domain, unless it is a top 100 keyword.