Our club, the Triple Cities Runners Club (TCRC) of Binghamton, NY, requires that all of its races be run on certified courses. In fact, the first race measured with a Jones Counter was the TCRC race: Vestal XX in 1971. Of course, in those days the certification was done by Ted Corbitt. For the first few decades after this, I measured the club races and never charged for the service. More recently two women club members, whom I trained, do the measuring and do charge but, as you say, it is a small price when you consider the fact that the course will stay certified for ten years.
The fact that the club certifies their races, has encouraged other local races to have their courses certified. Runners like the fact that when they run a race in the Binghamton area, they are confident that the course is accurately measured.
I am sure that you are right that the RRCA does not require that RRCA-sanctioned races are not required to be certified. But they should.
Alan Jones