This method is definitely suited for the more patient types. As OP mentioned, it's a numbers game, so if you have a hard shell, and are determined to go on after X amount of rejections, this method is for you.
I am not knocking it, but I felt the OP just mentioned "numbers game" in a blase kind of way, whereas in reality it's quite a boring method to undertake.
Good luck to those who try. :drinking2