Would you be ok with it if your browsers at home, in the office and on your mobile phone always showed your bank balance on the top of the screen in a large font?
I assume most users would not. But they would be ok with their bank balance being shown if they specifically opened their bank website.
"What if we capture the flashes and steal the password?"
Well, if you're positioned to capture the flashes, you're definitely positioned to just watch me type it in...