I think you are correct that eating stuff from the farmer's market is more expensive. My viewpoint is that if I eat better I should be able to live a healthier life not longer.
In my case I have decided to prioritize my food, and I am currently unemployed. I have decide my eggs and fruit are coming from the farm. Yesterday I bought some pork chops at the farmer's market.
I think if I can eat primal 80% of the time and 50% of my meals come directly from the farmer than I am better off than if did not eat all this way.
I comment you for caring about your food, I am 47 years old and never new how bad things could be.