I WANT ANSWERS to a serious question.

Why doesn't everyone run the Return Address scam with posted letters? Why do we not all write in the 'To' person in the return address box and then slap some insufficient postage on it? Or no postage at all?

I've never done this; lawlessness frightens me. But I want to hear from anyone who has, and be told definitively why it wouldn't work 100% of the time.