I don't know a single fan who has abandoned them, don't know what you are talking about. Their fans are as comparable to ours, dead sure about that and I know quite a few friends and relatives.
The home British fans are loyal, but a large part of the world wide fanbase jump from one team to another, one year it's Chelsea another year it's ManCity, they will jump on the Liverpool bandwagon should the club start winning trophies regularly.
My whole point is about the add and how it shows the MU dependence on merchandise sales that bring in more revenue than the Champions League.