Well just because you can't "see" anything wrong with them, doesn't mean they are perfectly flat. There's visual inspection, then there is .05 inches.
You may not need it every time, but prolly once a year I would think to make sure they are truly flat. I just see it as a possible source as to why you are burning pads so fast. I know what Endless pads cost.
I know some guys go the route of just buying cheap-o rotors and then basically throw them away instead of turn them. It is cheaper than buying 900.00 rotors, paying t0 turn them, then cracking them next weekend and having to buy new ones. They basically treat them like disposables.