about 275 members....I don't know the breakdown of membership
I think the 265-275 number is the number of full memberships i.e. Private/Group level. 30 properties times 8 full members per property would be 240. Additionally, 3-4 new properties coming up i.e. 24-32 memberships would mean 264 - 272 members which is equal to the numbers provided.
That said, it takes two Affiliate and four Associate members to make up the equivalent of Private. Numerically, I would put the membership count to be around 375-400.
Here's another tidbit. HCC has a 2:1 resignation policy but an Affilate member needs only one Private/Group signup to be able to resign.