The problem with this is that the erosion of quality is not necessarily noticed immediately, but the slow increase of dissatisfaction builds until people finally reach the quitting point.

There's many instances of media where I look at older versions of the product and think, "man, why is this quality absent from their product today?". I didn't consciously notice it when the snowball was still near the top of the mountain. But eventually the snowball got big enough for me to bail.