...in terms of the carriers budget, and through life costs, nuclear watchkeepers are a tiny insignificant proportion of through life costs, even if we had to bribe them with silly wages.
...its not just the cost of fuel. Think about its endurance, speed, range etc. A nuclear powerplant solves many of them both in terms of propulsion as well as powering ships systems. Could you imagine having to do a RAS in that massive carrier for fuel?? would be impractical and would mean we are dependant on either continually topping up tanks with regular RASing or dependant on having to fuel up regularly on deployment at prices we cant control. Fuel is a major consideration in planning on an FF/DD and the current carriers let alone something as big as the QE. IMO going non-nuclear is a compromise too far.