I point blank refuse to buy a magazine in a plastic bag. Based on what I've seen lately particularly from Fons & Porter the plastic bag is usually hiding a severe lack of contents.
If I remember I send an e-mail to customer service to say they lost a sale.
I think if they read all the threads on this board on this very subject they'd stop doing it.
And I agree with those who say if they really wanted to see it, they would open it. But since it just annoys the dickens out of me it's a long time since I was tempted to open one!