I feel it's important to weigh in here with a word of encouragement and another of warning.
First, by way of encouragement: Don't let up for a moment on your letter writing! I started letter-writing the moment the shutdown was announced, and began getting the word out to everyone I knew to participate. Trust me when I say that nothing makes an impression on a corporate executive like a paper letter sitting on their desk. It has made the rounds though the building, it's existence cannot be denied or forgotten, it is a tangible expression of how a customer feels about the product they are paying for, and THAT makes it a powerful totem!
Second - and I say this as owner of my own small company and a person married to a senior executive of a much larger one - handwritten letters are rarely read or taken seriously. The hard truth is that they're a perceived as being unprofessional, immature or irrelevant, as they are frequently assumed to originate from minors or individuals without good communicat skills, and along with that assumption - unfair though it is - the author of such a letter is perceived to be lacking in buying power, and that makes their opinions or feelings irrelevant to the business owner reading it.
So I urge you: Write your letters suing a typewriter or your favorite word processing software.
DON'T print out multiple copies, but re-write and re-express your passion for CoH and your commitment as a customer to the game.
Multiple, varied, professional, mature letters show that you are not going to disappear after one letter, which also tells them you are not going to disappear as a paying customer! Most important, send your letters via Certified Mail, with a Return Receipt Request. The first makes sure your letter goes directly to Mr. Kim, while the second let's you know it got there and who signed for it.
"We can do this. We're heroes (and villains). This is what we do, because no one takes what is ours!"
"Never give up - Never surrender!"
Dasher