Let me try to reword my point. Imagine a dominant could put a chip in your head that would ensure absolute, instant obedience to any order he gave you. Which would have more value: your submission with or without the chip in your head?
I argue that your submission in the case of forced obedience has no value, because there is no choice. True value comes from making hard decisions day in and day out, a thousand little moments when you choose to put someone else before yourself despite a desire to stay warm, comfy, asleep, sitting, whatever. A good dominant will know that you would rather stay under the blankets, stay in the comfy chair, eat your meal without waiting for him, or take the tv remote.
He'll value you specifically because the world is full of temptations and comforts that you choose to ignore to serve him. If those temptations weren't there, or if you had no choice, then what value would your submission add to the relationship?