The greatest resource at GRM is the years of great "how to" and related articles, but you've made them almost impossible to get to. You want to increase your subscription base? Exploit that treasure of old articles to show new visitors to your web site just how terrific your magazine is.
Those old articles would also get the word out re. GRM. For example, there's an article re. aero that came out Spring 2010. If I could get to that article it'd be linked in posts at several forums that are discussing aero right now. Multiply that by a thousand because of all of the other useful articles you guys have written. Consider the marketing and click-thru advertising value of having old GRM articles referenced in conversations all over the Internet.

