I understand how final sale can be annoying, but you have to understand that a company as large as J.Crew has to get rid of their spring/summer stuff in order to make room for fall/winter.
And as far as a Factory goes, that's actually not the case. It's a completely separate line. No items from the mainline make their way to the Factory line.
You are wrong, many items from the mainline make it to the factory line. I have seen shirts I purchased from the mainline pop up the next season on their factory site. Also right now one of their oxford shirts(it's a navy and red shirt) was from their F/W line last season and is not on the factory site.