After watching my Ottoman Empire embroil itself in revolt after revolt due to my bad boy wars, and after slaughtering many of my own citizens who kept refusing to accept they were now Turks, it came to my attention that the +3 to revlot risk for Tax Collectors becomes pretty damn important in a multi-ethnic and religious empire. My question is how much extra revenue do Tax Collectors generate in the province? I want to be able to do a cost-benefits analysis to decide whether they are worth the revolt risk. I know that with chief judges the risk goes down 1, but that extra +2 still bites hard once war exhaustion gets past 4 or 5. Any ideas?