Could you detail these. Typically the car rental companies will perform no maintenance other than a valet. The cars are moved on long before they need servicing. I could see overheads being larger, but then they will typically be dealing with many more rentals on a daily basis. Plus as noted before, there are many ways to add extras, from insane fuel prices, insurance rip offs, charging the for child seats, ridiculous charges for minor damage, additional charges on top of speeding/parking tickets etc.
Let me give you you a few which typically takes up the most cost
- Premises and garage space - which one do you think cost more - for the car or bike rental
- Labour charges - front office, back office , mechanic, valet - car or bike
- Reservation system / contact centre - Bike or car
- Depreciation cost in absolute value - car or bike