Blueberries are well worth growing if you have space and the right climate. The bowl that I picked today would have cost me ten dollars at the farmer's market. I've picked that much 3 or 4 times already this summer off of 3 blueberry bushes.
It did take awhile for the blueberry bushes to become this productive. Part of it was reaching the right age. The other factor was that I finally figured out how to give them enough water. One spring while I was expanding the vegetable beds I started piling sod in front of the blueberries. I realized that it would create a type of swale that would catch water so I left the sod in place. A year later I had more blueberries than I'd ever had before.