Unfortunately, your information regarding the radiation from DMX machine is wrong. Each picture from the machine is about the same amount of radiation from one standard image. Based upon your statistics, you have had 2700 images of your neck at one sitting.
X-rays are not static if performed at the endpoints of motion. For example, the lateral flexion and extension X-rays of the neck will show the endpoints of motion of each vertebra with the respective position. If you compare these endpoints of motion with the neutral lateral film, you gain the knowledge of pathological motion.
DMX in my opinion will substantially over-diagnose many problems that are really normal variants. I assume that the surgeons you have seen also know this and in general, no one wants to perform surgery simply on the findings of the DMX.