Isn't there a way to remove the spammers from the forum? Also, I've been on other message boards where you have to wait for admin approval before you're allowed to be part of the board. Maybe you could do this, and in seeking approval the person has to answer a couple of questions about their interests...maybe what kind of flute they play or what they like about the flute, etc. Maybe the spammers answers would be easy to spot and you could keep them from joining. Just a thought. I'm not really a computer guru, but I've seen this kind of thing done before to keep out the "riff raff".
"Music is enough for a lifetime, but a lifetime is not enough for music." -Sergei Rachmaninoff