Good answer, but I don't like the counter-example. OP can buy a new bike instead of performing the repairs. Thus it's either buying a new bike or performing the repairs, for the car+petrol analogy this is not the case. Even if you buy a new car, you'll still have to pay for petrol

@Kibbee Thanks for you comment, I know the bridge of Millau is not meant for riding, I just used it as an example as I know there is a large difference between ground height and road height.