I think Redanman did a good job on the other thread:
"Anything more than a bar, locker rooms with nice showers and mesh metal lockers (or an open area like GMGC), a place to eat or two is overkill.
A clubhouse can be a central part of a thriving community. The friendships and comradarie that exists on the greensward can be enriched and ameliorated by a thriving and positive community of neighbors and friends. The clubhouse can be a catalyst for that.
I'm so grateful that my home club invested in building a new clubhouse to complement its top-shelf golf course. I love playing 18 holes with my buddies, joining them for a few beers, playing gin rummy in the card room, then washing up and meeting our spouses for drinks and dinner in the clubhouse. I enjoy eating in the main dining room, watching the sun set over the lake on the 18th hole, walking out on the deck to smoke a cigar, pointing out over the golf course, and recreating the "drama" of that afternoon.
An excellent clubhouse can accentuate a pleasurable round, or provide respite from a disastrous one. It's an opportunity to extend the enjoyment of your friendly round, or cultivate new friendships with the other daily combatants.
Clubhouses are integral part of golf course architecture and golf culture. One of the most pleasurable parts of my trip to California a few weeks ago, was congregating in the Monterey Peninsula C.C. to enjoy a beer after our round. I looked across the room and there must have been thirty gentlemen sitting together in a long row of tables that had been pulled together. They were joking, boasting, laughing, and needling eachother delightfully. I thought to myself, now THAT is GOLF! You can NOT cultivate that sort of comraderie while you change your shoes in the parking lot.