spam lfg for a while.
Oh, please don't.

I understand ninjas are annoying, but I'm actually more like to put YOU on my never-group-with list if you're a LFG ninja spammer. By spamming the LFG you're not just making it hard for so-and-so-ninja to get a group, you're making it hard for EVERYONE in the channel to find a group while having to wade through your spam.

Keep legitimate talk to legitimate channels. Don't make LFG as bad as Trade.