IMO, I've always seen the head pro as the "golf guru" of the course. I've had the pleasure to work with some great pros at the courses I've worked at and here's what I perceived their main and important job functions and contributions to the club to be:
- Resident expert on USGA rules: this can include marking the course and setting things up correctly for a major tournament (though I know plenty of supers well-educated enough in rules to do this on their own) but mainly the pro should be the guy to make the end-all decision in any tournament or rules debate question
- Often the best passage of communication of on-course issues from the super to the membership: most pros, by nature of their job, tend to be better communicators and "people persons" than superintendents. While a super should be asked and referred to for nearly all course complaints and concerns, often the pro, with good communication from his super, can field many of these questions, or filter through "whines" or emotional complaints about course conditions and real causes of concern. The best pros I've worked with are ones who take an active interest in knowing what's going on at the course at all times, give his feedback on how those maintenance practices might affect course play, and work with the super to understand the rational behind doing such things and creating an alliance to educate the golfers for the betterment of course conditions.
- Some great pros still have the time and ability to give lessons: this is more the older generation of pros, but even when I started golf (not that long ago), the head pro was always regarded as the best teacher and the main guy to go to if you really wanted to dial in the finer points of the game. Nowadays, head pros often get straddled with so much administrative duties and this endearing practice takes a backseat to running the business
- Organizing and ensuring the success and enjoyment of tournaments: for public courses, this means being directly responsible for the main revenue stream of the club and for privates, this is often viewed as how enjoyable a golf membership at that club is.
- Building a team: this includes hiring the right people to take the absolute best care of the golfers, from outside service to front desk to on course assistants to marshalls. Hiring the right people and managing such a large group is key to a golfers enjoyment and experience at the club and the pro is directly responsible.
- Running the golf shop: this sometimes gets handed over to an extent to assistant pros, but the head pro has a retail business to run as well, and is responsible for meeting his members needs and wants, being the resident expert on club and ball and apparel advice while trying to generate revenue for the club.
I know I'm still missing some, but if all this doesn't amount to "doing something for the club" I don't know what does. The head pro, with the super and the general manager and the food and beverage manager make up the vital heart core of any club and most clubs suffer a severe lack of quality and experience when they are missing any of these key leaders.
One is not necessary more important than the others, but pay scale most often directly correlates with experience, education and responsibility, both in scope of work and in regards to management of club finanaces.