What percentage of login attempts typically fail on a site with 10s or 100s of thousand members?
I’m mainly interested in username/password authentication where the user enters the wrong username or password. I realize there’s no “typical” answer since there are so many types of sites - do users login every day or once a year - but I would like to get some idea of what other site developers see.
Is there any online reference that shows login results for a variety of web sites that I can use to backup any claims I make about this?