A magazine would cost money to produce, take time to produce and then there would be the question of how often a magazine should be released.
All the information that would be contained in such a magazine would be limited to a few pages where as this forum contains everything that any one of us has discussed and is always there plus it is instant, you have a problem with your car, writing it in to a magazine would mean at least a wait of a month to have your question answered where as posting it on the forum, you should get a reply within 24 hours.
The same applies for items wanted/for sale, cars wanted for sale, almost instant replies.
All the projects are contained on these forums with loads and loads of pictures to accompany them which you could not do in a magazine etc etc.
However, we could do a monthly feature on a member or a members car/project or similar on the forums if that is what people wanted, we already have a monthly photo competition running