Lee Anne,
Maybe you need to try a variety that produces well in your climate. I know there are a few cold climate varieties - I'd have to research to come up with some. I say this because your yield can depend a lot on the weather. This year we've experienced so much heat, the severe drought has caused the flowers to all drop before they can even make any fruit. I've pulled most of them. Cool temps and excessive rain will also hold them back. Plus, tomatoes are heavy feeders, so good, rich soil can often correct many deficiencies.
It is true of course that some of the heirlooms just don't produce much- but there are folks that think it's worth the effort to get the flavor.
There are some very prolific varieties out there, Abraham Lincoln comes to mind, it yields lots of red fruits that are very tasty and produces up until frost, for a long growing season! Stupice has always done quite well. Black cherry is another that grows lots of cherry sized (actually a little larger) fruits - they are at the top of my list of favorites - they will also give you fruit up until frost.
What "regular" tomato are you growing, if it has a name?
