E3 is an industry event for game developers and publishers, specifically businesses, and geared towards press, not the general public. OCR would have to do a lot of things before we'd be eligible to exhibit anything at E3.
Our con presences are geared towards fans and general public. MAGFest, PAX East, Otakon, etc., those are the kinds of conventions that are a good fit for us. Tournaments like Apex 2013 are also nice, albeit different from what we normally do (we had a vendor table in the vendor area/artist alley and sold merch, rather than doing a panel or performance).
Anime conventions are good because there's a lot of crossover in those fan communities.