You wonder about krypton and xenon, these are gases with only speciality applications and are probably minor byproducts from an air liquefaction plant. The mark

You wonder about krypton and xenon, these are gases with only speciality applications and are probably minor byproducts from an air liquefaction plant. The market for helium is much much larger. To ramp up production you'd have to build a new plant, and pay for it only through the sale of minor noble gases, the cross-subsidy from nitrogen and oxygen suddenly disappeared. Markets involving joint products are funny things.