While I’m far from successful in matters of business, I do know the simple fact that networking is key to success in business or otherwise for that matter. Conventions are attended by thousands of people you would have never met otherwise in your everyday life. By using photography as a bridge, you have a method of networking with a good subset of those people who attend and cosplay or photograph others. Your goal could be to make friends, or business associates that could result in mutually beneficial collaboration.
Once you have made a contact, you can stay in touch through the Internet with websites like Facebook or by way of e-mail. Oftentimes, there are convention regulars you will be able to meet every year to further strengthen relationships. Anime and Sci-Fi conventions usually have dealers rooms and professional panel discussions, which are yet another outlet to talk with people who might be in an industry you have an interest in being a part of.