Who knows but that might be part of it or it might have been a bad year for them. Tomatoes are a fickled fruit that the conditions have to be right for them to do great, but when they take off and produce you better be prepared to eat them for every meal!!
But the funny thing about my plants is that I have to plant one plant just for the green ones so I can fry them up. Otherwise we would never have ripe tomatoes around here!
Billy