First of all, yes I do.
Second, I buy them not to wear, but to collect. I have every home and away shirt for the last 20 odd years or so. It's a way in which I feel that I can support the club financially, even though I live 3,000+ miles away from Anfield.
Third, the implication of your question is that men are somehow infantilized by their desire to own a football shirt. So fuck you dogboy, you mature cunt.