Yup. Want to increase the $ marks? its how you implement what keywords and what money making capsules. I had a $$ hub I added two amazon capsules to and it went to $$$. I also had two $$$ hubs on just the title and tags and when I filled in the actually body content and images it dropped to $$. This number actually does mean something, its based on the keywords, ad position, and amazon items/keywords. For the most part, if you ram a ton of "buyer" traffic to these pages, say a niche page, the ones with the higher $ statistically will do better based on those factors, but the hub I made the most off of on adsense is a $$$ and the hub I made the most probably off of amazon are $$.
Hope that helps,