Like AlphaSigOU said, on many BB (not sure about this particular program) you can restrict the avatars people can use. For example, on the official Smashing Pumpkins board (where I used to post, haven't been there in ages) you could choose from about 8 avatars from different periods in the Pumpkins' careers, nothing else. I think that that would be much better for GC.
Sig pics would just get out of control. I don't think they're that cool anyway.
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