My take is that you don't get rewarded for it directly, but rather once you're finished, you can move on to the next thing without having to constantly firefight and squash bugs on the previous project. So ideally you can get a lot more done in a given half than someone who pushed out a pile of buggy spaghetti that they're now constantly having to deal with.

On the other hand, if you can ship something a few weeks faster that might have a few bugs, but the customer never notices, I can understand why a business would reward that.