Moving from a 125cc motorcycle to all bicycle commuting hasn't been cheap. I needed two bikes both customized for my requirements. One is setup for long tours and carries the kitchen sink and higher level components as the cheaper ones wear out too fast. The other is more basic and cheap enough I can lock it most anywhere and no one is likely to want to steal it.. but its setup just the way I want it. Then there are the clothes (especially for winter), the lights - and spare batteries. Maintaince on the chain/cranks etc. 2000km a month wears stuff out.

Is it cheaper than the motorcycle was? No. Is it cheaper than running a car? For sure. Are the health benefits worth every cent? Absolutely.