Because I do my own repairs, ride reliable old classics, buy high-quality used parts, and ride for transportation as well as for exercise, I do not consider bicycling expensive.

The biggest problem by far is incompetent, careless, inebriated, distracted, and/or aggressive motorists. In most states, it is too easy to obtain and to retain a driver's license, and too many judges and juries regard driving as a right, instead of the privilege it legally is and morally should be.