Be an active member. Throw yourself into it. Head up a task force. Your investment stands to deliver sizeable returns. If you're short on time or you're being pulled in too many directions, stay less involved.
Minimal involvement is better than no involvement.
Just by joining a committee, you'll have access to the latest developments and expertise in that area. Think of what you're missing by not joining and then think of what your clients are missing. It's up to you. Be sure to review the committee listing and see what's there for you. Once you've decided which committees you'd like to join, simply complete and fax the attached form to the Section office.