I disagree. Solo work can be very difficult, but also rewarding. (Speaking from experience) I can think of a few reasons why you should join anyway. 1.) Increased motivation - Once you've paid for membership, you're going to have more motivation to go out and practice more. Even if it is only for 10min whenever you can. 2.) Increased Credibility - I would start out with an ARMA uniform (red and black), and start working on the cutting drills. This will give you a good base to start performing your cuts etc. 3.) You will be able to use the ARMA for networking purposes, and that will help you gain more members.
Are you and your friends going to practice during the semester anway? If so you might as well do it the "ARMA way". The cost of membership is less than any new video game, and keeps you healthy too! (Shameless plug from the Nutritionist) If you do join, and they don't, be uncompromising on a few points. One thing that I always did was that I would talk about/demonstrate anything that was in the free section of our website or anything that had been published. I also let people know up front that there were somethings that I won't teach them b/c they are "member's privliges". I had to pay my dues for them, so I don't think that it's fair that someone else gets it for free. I'll be frank, you might lose people over this issue (speaking from experience), but it's worth it in the long run.
Anyway, that's my $2. As you can see I'm opinionated on the issue, but that's b/c I did it that way, and know it can be done. In the end you have to make your own decision on the matter. Either way, I hope to see you on the Elist. (Sooner rather than Later

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