New and improved

"New and improved": Why do it? Why? People who chose to buy your brand of food do it because they like it. They've probably tried a variety of similar products before settling on yours because they like it as it is. Changing it means that there is a strong chance that they will no longer like it. Meanwhile, all the people tried it once a year ago and decided that they didn't like it have already settled on their own favoured brand, and aren't likely to sample your product just because it has a new recipe.

I've just lost one of my favourite types of soup to the green pepper menace. This is "improvement." Since I hate peppers, I will never buy it again. Had they not added them, I would have continued to buy two tins a week.