They only delete if they don't have the sales.

Because we only buy Australian made in our household, we always bought Rosella Tomato Sauce. Even though it was more expensive and the packaging was less convenient. However, most Australians ditched it in favour of cheaper sauces in plastic squeeze bottles. Hence the sales dwindled.

If the sales were high the supermarlets would have continued to stock it.

But no retailer can be expected to carry dead stock.