There are only big taxers, big traders, supermemes, occasional individuals of great power; and a few other organizations, like Science, that can fasten parasitically onto them.

I agree with your general point about funding Science. I agree with your general point about there being more potentially beneficial large scale institutions than actually exist.

I think that there are a small handful of additional types of large organizations which do manage to exist in addition to the types you've listed:

• coordinated buying clubs (not quite the same as big traders)
• member-supported testing labs (consumer reports and underwriters' laboratories)
• unions
• universities
• armies
• (religious organizations are perhaps the same as supermemes - yet they also have organizational structures that are somewhat separate from the memes themselves)

Each of these is beyond the 50 person ancestral limit.