There are a lot of interesting HubPages, blogs and websites that have interesting stuff on them. Even though Google may put some AdSense ads on them, if the subjects are obviously such that few people are interested in clicking on an advertisement, few clicks.
My first Hubs were practice, and I just wrote about "whatever". Few ad clicks. In my later Hubs, I have tried to target subjects that people will want to click on the ads. Getting a few more, on average.
For an ego-boo Hub example, with few clicks, see
For an example of a Hub that gets some clicks, see
BTW, it is possible you are not doing too badly at all. Consider that at a typical click rate of 2%, you would, on average, have to get fifty page views to get just one click. So, depends on what you mean by "so many page impressions".