Sure it does. Users fear warnings they don't understand, and some will not click past they warning. For those users, you might as well replace the page with a

Sure it does. Users fear warnings they don't understand, and some will not click past they warning. For those users, you might as well replace the page with a 404 for all the good it does them. Maybe there are not MANY such users; I don't know and would love to find out. But surely some.