Actualy, it's not as trivial a number of users as you'd think. There are 3,833 users who have never logged in, not even once. There are an additional 9,668 who have logged in, but have no nodes. (These numbers are straight off of the frontpage of Crack for Statisticians.) Even just the never-logged-ins are 20% of all users. (BTW, the second number is "Logged In Once, No Write Ups", but I'd be careful with it -- number-of-logins isn't stored, only last-logged-in, and the number-of-writeups is often wrong, and doesn't count Q&A nodes, IIRC.)
Confession: It does an Immortal Body good.