I was a member for many years. But have not been one in the last 10. I no longer see the point. My dealer used it as a sales/marketing tool (which is what HOG actually is meant to be!). Required the HOG chapter to "rent' the area in the dealership used for meetings. Had sales pitches at every event. This was also during the height of the $15,000/15 miles and your a biker craze. Way to many self-involved, status seeking people in that chapter. Besides, the idea of a chapter run went from a 150 - 200 day, to a 50 mile round trip ride for lunch.
It may have changed now, but I doubt it.
As for the benefits. I own maps. I don't by parts from the local dealer (way to expensive, that why I love the internet!). And my bike insurance company has a great assistance plan, as does my AAA membership.
But, to each this own!