Would you do it for your country, for liberty?
With or without Ron Paul, we can change the party from the inside and return it to its roots. As precinct committeemen, we can change party platform, elect party officers, endorse candidates, and even elect candidates to fill vacancies. I know of three specific instances in which a small group of precinct committeeman directly elected or nominated candidates to fill a vacancy... We're talking a group of 3 people in one instance, ~50 in another, and ~250 in another.
We can have a significant impact on the party and elected officials if we get involved.
Also, precinct committeeman are provided with great tools for education. You are given the tools to target every voter in your precinct and spread the message of liberty.
Regardless of your goals, to educate the people, shape the platform, influence elections, taking the position of precinct committeeman is the most efficient way of reaching those goals.