If you are frustrated by a lack of comments, a lack of people clicking on ads, or by a lack of plain old traffic, why should you keep blogging?
Well, for one thing, building traffic takes time. You have to post on different blogs, websites, forums, etc. to get your blog out there. No matter what type of blog you have or the subject of your blog, there are always going to be places where you can find a good amount of traffic.
If you like and have a genuine interest in what you are writing about, why care if someone reads it or not? You are putting it out there for the whole world to view, and if they view it or not, thats their business. As long as you enjoy doing it, you shouldn't stop.
Good luck blogging!