"Heavy hitters. With obvious cognitive abilities WHY are they involved with Watchtower?"
That is the million dollar question. And the answer could be in the preceding sentence to this one. My humble take? They've got to be getting paid for this. Otherwise, perhaps they feel they've made and invested enough (and they've got it all locked away in trusts), that they can afford to take the "vow of poverty".
But your point still stands: how can people so smart, so educated, be so dumb as to throw in their lot with the Tower? Methinks the incentives are high.