Femme fatale costs 9 to install and I am struggling to figure out why it costs so much. The card has the ability to render a piece of ice fairly useless by allowing you to break its subroutines by paying one coin. However, I can also do that with other, cheaper, better icebreakers. I am just a little confused on why it costs 9.
Honestly I think that ability is just the answer. It's a decent sentry icebreaker (filling a slot, albeit at a high cost), but a great counter to ice like these. Just imagine Corp plays a Wotan, and suddenly you bust out a Femme Fatale. Anyway, you probably don't want to use FF anyway without some sort of ability to help you install it cheaper. :)