Why do most yogurts come with the fruit on the bottom?

We had no idea that this topic so consumed yogurt lovers. But the dairy consultant contacted indicated that yogurt lovers have strong feelings about where to put the fruit in their yogurt containers. We were told that there is no difference in the contents of fruit-on-the-bottom yogurts versus prestirred varieties, but also added that many people like the idea of stirring the cup and doing their own mixing. Some claim that they like to see just how much fruit is really in the cup! Other people couldn't be bothered and much prefer to have the premixed product.
Some prefer the prestirred varietites because they tend to have a softer consistency. Others feel cheated if they can't stir the yogurt themselves. And some yogurtphiles, like to keep the fruit on the bottom, dipping in when desired. They alternate spoonfuls of pure yogurt with doses of fruit and yogurt. But not everyone eats yogurt straight out of the cup. Many folks like to eat yogurt out of a bowl. They tip the container upside-dowm into a bowl, and end up with what looks like a fruit sundae, with the topping where Nature intended it to be--on top.
Why don't yogurt makers try putting fruit on the top? The heavy fruit would sink to the bottom anyway, and unevenly at that.