> But prices aren't based on fairness, they are based on demand and supply
If they were based on supply and demand, locality of seller would have no effect on the price buyers were willing to pay for goods that aren't location-sensitive, e.g., remote work, because it's not a location-bound market and goods would trade at the global market clearing price absent (inefficient) artificial market segmentation that is only possible (for buyers) when there is an effective monopsony for the particular good/service being purchased (since competition would exploit the underpriced segments buy buying up what they are selling at a price above what the attempted segmenter was offering.)