From the same post you quoted (added emphasis mine):
In short, it’s 50 to start with and then 5 per person in clan. If you don’t have a clan, it works just like having a clan with only you in it.
This formula sucks for PVE(-C) players, who have very little incentive to form a clan. I wish they would consider having different formulas for PVP and non-PVP servers.