- to see if there is one issue in particular that attracted new readers
- to see if there is a mix of recent "devotees" and "old timers" on the forum
- to see if there is a steady growth of new readers with each issue.
- so people can say "I've been reading it longer than you so I'm better... nerrr!"

For me, it was issue 3, after someone mentioned it on www.atari-forum.com. Managed to get issue 2 as a back issue and was a subscriber from issue 4 onwards.
How about everyone else?