I would place a CAP logo on my site even if it means that I miss getting subaffiliates to sign up under me. I would figure that most have signed up at the popular places prior to finding a logo on my site anyway.
CAP has done a lot to help me learn the business and the fact that they let affiliates attend the conferences for free can be a trade-off.
The conferences is what took my business to the next level in as it allowed me to meet anyone I wanted to work with or get to know better plus the information you get is invaluable.