To add to this, i know a guy in the business and according to him, even the most expensive wines don't cost more than 10 bucks to produce. Thing is, you can't indefinitely expand how much really great wine you can produce, it requires good vines, on good soil, in the right microclimate, you can't scale that up for the exceptional stuff. So there's a disparity between supply and demand that drives up the price. All these 300$+ bottles come from vineyards that are so hyped they are particularly susceptible to that effect, for some of them scalpers already buy up the entire vintage before it even gets cellared and then resell it when it hits ideal drinking age.