Why is Femme Fatale so expensive to install?
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. :)