I've also come across an article in a Swiss newspaper according to which supermarkets prefer tomatoes varieties that have a "consistent" taste all year round – and because you obviously don't get extraordinarily tasting tomatoes in winter, this then means mediocre-tasting tomatoes all year round instead.

(So are they afraid that if they start selling truly delicious tomatoes in summer, they will no longer be able to sell mediocre tomatoes in winter?)