Too many casual observers of the semiconductor industry think of Moore's law as a basic fact of nature, like Newton's law of universal gravitation or the three laws of thermodynamics. Actually, Gordon Moore simply observed the current rate at which semiconductor makers could shrink transistors and predicted it would continue.
What chip makers actually charge for their wares is driven at least as much by the law of supply and demand as it is by any advancement in chip density. Making chips requires not just deep technical skills, but deep pockets. A dynamic RAM or NAND fab costs billions of dollars and takes several years from the time of investment to actual chip production.