That would be a good reason 
Just as well, then, that I stopped giving channel currency to lurkers a while ago. The only reason I process JOINs at all is to synchronize usernames and IDs in my database when they come in. As for currency, I make note of anyone talking in a 20 minute interval, and give those users currency for that period of time (in my case, 25 for followers, 20 for everyone else).