I generally don't chime in much here because I am a keen observer like many on BHW, but there are a couple of things I have not seen written in this thread addressing CB's performance on individual levels. [To set the stage for my credibility, I have been selling ebooks on CB since around 2004 (my own creations) and I constantly think about the next ebook to write.]
Here are some possible reasons for lackluster sales lately:
One, economy. It's bad out there. Even if you have a killer product that you are promoting, that $47 or even $27 can go a long way when buying groceries or keeping your gas turned on. I think a lot of newbies and even seasoned CB veterans hearken back to the days of boasting by "gurus" about how many sales they are generating and how rich they are getting. But this was years ago, not today. Things have changed. The Ric* Jerk comes to mind. These guys are pumpers (pumping you up and getting the cha-ching symbols glazed across your eyeballs--your credit card in hand, eager to learn how they did it). They create disillusionment on how things should be and will always be from now on if you can tap into even mild success. Don't be fooled. There will be bad days. Bad weeks. Hell, even bad months. It comes with the territory and lately, the economy. It seems things are turning around (although in the minutest sense). Keep your inspiration high and your expectations low for now.
Another thing to consider: growing cynicism as the internet evolves. Do you think that Joe Internet is going to think the same today as he did three years ago? Two years? Not a chance. We are all constantly fed information as we surf the internet. People talk shit to masses about things (in this example, like getting ripped off from CB products) and what that does is instills a sense of cynicism and skepticism. It's hard to sell anything to someone who thinks you are scamming them or going to sell them a bunch of rubbish. People are creating pieces of shit ebooks and over-hyping them; once the buyer realizes this and gets their much-warranted refund, then a stale air begins to envelope everything and the word eventually gets out about their experience.
Another thing to think about: target audience. Say you are selling an info book about how to be the best internet marketer in the world and you have all the techniques contained within the ebook to propel the wannabe IM'er to the top of the industry. How effective would this ebook be to market this product to uninspired, cynical people who have been beat up, ripped off, lied to, let down, and kicked around by scam after internet scam? It's a freaking uphill battle. I love reading a good pitch, and I may even click on link to see how much the pitchman is asking of me (possible reasons for the pay page impressions, albeit lack of sales), but will I fork over the dough? That is up to how compelling your pitch copy is.
Summary: You have to constantly tweak, experiment and decide if a product is worth hanging on to or not. If you are selling an ebook on how to build a nuclear fallout shelter and did well for the last ten years of selling it, then suddenly every country in the world disarms all of their nuclear weapons... then what do you have? You have air--the product is no longer viable. Time for another strategy.
Don't put your efforts into a single product, and then based on its performance, you decide whether or not you will give up on the whole idea of being an internet marketer. You have to persevere through all adversity in order to succeed. Don't blame it on CB, maybe it's you. Maybe it's your ever-evolving target audience (find a better crowd?). Maybe you have a product that has run its course and now you have to ignite a new campaign on a new product. Just don't immediately look to blame CB for your lack of sales. I seriously doubt they would risk using even one rusty nail in the construction of their biz--it could bring down their whole amazingly lucrative empire. They don't appear to be that stupid.