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The reason why they printed people's addresses was that a lot of people requested it. Before the internet, fans would write each other letters about the letters pages. It basically WAS the geek section of the internet, only slower.
You'd get a letter published about Batman and I'd write to you and say "I liked what you had to say about Batman, I wish they'd have him fight Bizarro" and you'd write back and say "Thanks, but I don't think they should rely on crossover events too much" and then I'd take 200 pictures of my cat and wait for them to be developed, and when I found one where he looked sarcastic I'd write WHATEVER on it in magic marker and mail that to you, and then you'd mail me a VHS copy of a Rick Astley video with "Awesome Batman Video" written on the label...
Bonus quote:
"Listen, I just think it's bizarre and funny. My main consideration is that my daughter doesn't get embarrassed about it."
-Rick Astley on Rickrolling (via Stereogum)