Source for your claims?
Plus do you know how expensive it is to support the whole cable infrastructure, including personnel salaries, etc. I am not convinced your math is right, but feel free to prove me wrong.
What do you think cables are made of? Gold? Lol
What do you think is more expensive maintaining the cable infrastructure or the road surfaces under the extra heavy buses?
Here is a good youtube video on the issue
My city recently decided to pull down the existing overhead cable network in favour of ‘local’ batteries in buses (was aging and needed a lot of maintenance which they were allergic to)
Unfortunately, that doesn’t really argue either way, as same city is now seeing the issues of not maintaining it’s water infrastructure for the last recent decades… They do some dumb shit