How common is offering a dark mode outside particularly programmer-y/designer-y spaces?

We'd like to but don't currently offer it because it would be a fairly involved undertaking - we have a lot of images that would need to be updated with corresponding dark versions to not look out of place.

As far as I'm aware though we've only received a single request for such a feature, and that request was wildly over the top exclaiming that out site lit their eyeballs on fire.