What’s the true cost of all the excess fees airlines are charging passengers nowadays? Right now we pay $25 for one checked bag; $50 for the next; more fees for anything weighing over 50 pounds; $2 per bag for curbside check-in; $3 for a bag of stale peanuts; $3 to access last year’s movie or reruns of the Match Game; yet more fees for an aisle or window seat. What’s next? An in-flight pay toilet…