Are you talking about your own forum profiles you added not the garbage SEnuke comes with?
So to be clear though... you are saying that forum profiles eat up WAY more captchas than any other part of a big campaign like the Full Monty?
Yes. Forum profiles eat up way more captcha's and most of the time, you dont see the bang for the buck. You are better off other tools for forum posting if you must do it, OR pick targeted related forums to your industry and manually post (higher return).