LA Guy, you know, I'm not sure the clientele at Mr Porter are all that different. Your post just reminded me of a conversation I had with a friend who is in a relatively senior role at Mr Porter. I asked him why the Outnet was just for women and he told me that their research tends to show that if men had a discount option available they would do all their shopping there and it would cannibalise the full price sales too much, so they don't want to offer this option.
I guess many men buy staples that don't go out of fashion, or are less concerned about being a season behind.
Well, that makes the policy make all the more sense.