Well from an evil business perspective their options are either - the product doesn't break and you don't buy a replacement from them because you still have a

Well from an evil business perspective their options are either - the product doesn't break and you don't buy a replacement from them because you still have a working product - the product breaks and there is a greater than 0% chance that you will buy a replacement product from them Of course in practice it's more complicated but I wouldn't be so quick to declare that the math doesn't work out.