A few clubs often get a little dynasty happening. A great HC and a pool of young players all together.
You had periods in the past of Canterbury, Manly, Parramatta, Canberra, Brisbane, Roosters, Storm, now Penrith. Little dynasties that bring lots of finals appearances, a couple titles.
There are certain clubs just run very well who know how to do it, so you keep getting those same teams staying strong, or gaining back a little dynasty after a short slump.
And clubs who are a struggling so much, poor business plans, board dysfunction, they haven't found the know-how to build a little dynasty so will continue to not see finals or win titles.