Because firstly, you'll reach an age where your not a uber-fan, and then you'll always have that on your chest, which tbh, doesnt even look that great. Its just something you notice that when you grow up, stuff like that just doesnt look as 'cool' as it did when you were young.
And like i said before once you get old, and the skin starts to get loose, you end up with a horrible looking blob on your chest.
Its a good thing it isnt you, that person is rather hefty >__>. He should of spent the money on a fitness instructor instead >_>