This is just in my humble opinion so no offense please, but I think it may be important to point out that the owner of this website (Randy) is also the publisher of Inside Flyer. There is a huge amount of info available here for free and I think Randy goes to quite some trouble to provide FT, keep everything working, not to mention dealing with the little spits and spats that break out occaisionally.
Therefore, I personally feel that it certainly cannot hurt to pay for a subscription to his magazine. FT provides an enourmous amount of knowledge, I feel its only fair to offer a little something in return. Add the many great mileage offers IF has and you really arent spending much money at all, considering what you are getting.
I do not work for FT, IF or similar in any shape or form. This is merely a personal opinion from a subscriber and active FT'er who has benefitted immensely from FT and IF. Worth every penny of the subscription fee.