When collecting reaches a point where it becomes an obsession and interferes with your social life and more important bills, then I'd say there is such a thing as collecting too many diapers.
This..best answer! For myself, its a lifestyle choice, I am financially sound and my social life is actually to busy. My friends laugh at me because I don't have facebook or twitter, but yet I some how through the old fashion way of communication and texting seem to stay ahead of the need to know curve.