The human brain is doing a lot of stuff that's completely unrelated to "being intelligent." It's running a big messy body, it's supporting its own biological activity, it's running immune system operations for itself, and so forth. You can't directly compare their complexity like this.
It turns out that some of the thinky things that humans did with their brains that we assumed were hugely complicated could be replicated on a commodity GPU with just a couple of gigabytes of memory. I don't think it's safe to assume that everything else we do is as complicated as we thought either.
I run local LLMs and they cost me $0 per query. I don't plan to charge myself more than that at any point, even if the AI bubble bursts.