Hi OP, I think what is more important is to understand the benefits of purchasing a used vs old; which is basically the price. For autos, this might count as a big discount.
However, I doubt if there will be a big margin in the CNC industry. Do you have an idea of where to get a new machine yet? For some people, they may just be getting rid of the old machine for personal or financial reasons.
The new one, of course, takes home the award.
I have to mention the fact that purchasing a CNC machine could be a costly affair that sometimes leaves unprepared investors in deep financial turmoil. It is not worthy it for you to experience the same situation.
At least, ensure that you have a solid plan that has been through scrutiny and vetting before committing yourself to the responsibility.
For investors who do not have enough money to get a brand new CNC machine, you do not need to panic.
Luckily, there are multiple of stores that sell high quality second hand machines, you just need to identify where they are located and make your order. You also could always build your own, the hardcore way.
Never let any mechanical device know that you are in a hurry.