"As a very broad generalisation it seems that more of the people concerned about leaving and recieving feedback are woman."

I noticed you said more of the people concerned, which indicates that some of the people concerned about it are men.  It's always been my impression that some men get as upset as some of the women.  Here's another generalisation, which may or may be true but it's the impression I get:  I'd imagine there'd be a lot more women sellers on ebay than men (as smaller sellers) so that could explain why there are more women who worry about feedback.