This topic is timely for me because I've spent the last 2-3 weeks inquiring about memberships at 9 hole courses. I live about 30 miles southwest of Boston, and oddly there are few public options. I don't have the time to drive 45 minutes to a decent course, only to take 5 1/2 hours for 18 holes. So as an alternative, I've been looking for a laid back, affordable private option. I've found a number of 9 hole private tracks near me such as Sharon CC (Stiles), Milton-Hoosic Club (Willie Park Jr), Norfolk GC, Foxborough (Cornish) and others.
The frontrunner has a number of features that would seem to give folks a good value and keep their interest. For example, it's a golden age layout of 11 holes where the 9th and 10th holes are different (if you're playing 18, your back 9 is a repeat of 1 through 8 and then a separate 18th hole), a secret hole that's used for special events, and a few other holes that play very differently depending upon if it's your front 9 or back 9. The property also has a full driving range and a practice hole with a large green, bunker and chipping area to practice 40-50 yard shots. The membership is limited to about 200 and there are no tee times. From talking to three members, there is almost never a wait and the camaraderie of being paired with new folks is welcomed by the membership. There's also a brand new clubhouse that everyone is excited about.
I don't know if other 9 hole courses offer an interesting routing, full practice facility and no wait times, but that's a recipe that attracted me.