See how I am still free to ignore any question you asked and answer just what I want?

Which would be: there is not really a need for stationary batteries to be expensive.

> See how I am still free to ignore any question you asked and answer just what I want?

It's a very common tactic by renewables maximalists, and I'm very familiar with it

It is a common trait of internet commentators, who are not paid for your education.

"And what's the cost of building on a mountainside, and how much is maintenance?"

Why should I feel it as my duty to answer that specific question to you? Seriously curious.

Because context matters, and the context of the comment you replied to was literally "oh, we should just build solar panels on mountainsides which are not good for other types of building": https://news.ycombinator.com/item?id=43254135

So the conversation, in context, is literally this:

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Someone: we should build panels on mountainsides

Me: how much more expensive will building and maintaining them will be?

You: Maintaining solar panels will be always way, way, waaay cheaper than maintaining nuclear. Also batteries will need to become cheaper

Me: Erm... That doesn't answer my question, and on top of that you're admitting batteries are not cheap either

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But, again, this is on par with what I expect in such discussions