You didn't post on AIBU 
I suppose you should look beyond the headline figure. Chances are women are doing more buying because they are the ones who do more shopping because....they have the time - or make the time - or are the ones who are more likely to make time to shop rather than be at work.
But - as was alluded to in the thread where this came up, there are loads more shops selling clothes for women and a lot more products for women such as in Boots.
Why is there such a market? Clothes - there was an article about a male TV presenter who wore the same suit at work for a year and no one batted an eyelid - he did that because his female colleague got 'comments' because she dared to regularly wear similar clothes.
It is fascinating.
The whole marketing and consumer culture is fascinating. How much do we need and how much are we 'told' we need in adverts?
I get the rage at the adverts for shaving legs and how confident someone feels. And how excited the woman is as she runs off to Boots to get her foundation sorted.
Mitchell and Webb had it right