Why is this downvoted? This is what a few sites do (ie, Craiglist) and it works well and I prefer it. It's not much different than a password with email recover

Why is this downvoted? This is what a few sites do (ie, Craiglist) and it works well and I prefer it. It's not much different than a password with email recovery option. I've also seen shopping sites do this to manage past orders.