Nothing ever comes to the quality at that price, so even if you can buy much cheaper laptops those suffer in quality and performance. This means the value per dollar is not any better than MacBook Air, unless you are extremely short on dollars.
Also the re-sell value of Apple products is good and combined with the durability of Apple laptops(this is where the repairability folks fail to convince most people because for most people Apple devices don't break down, they become obsolete after extensive use) the money spent on Macs turns to be an investment. The "Apple premium" you pay when you buy an iDevice is actually a recoverable when you sell it.