Having used some big, old, manual Bridgeports in school, I was looking into getting a small mill (manual or CNC) for hobbyist home use on metal and wood. I was surprised to see many CNC milling kits on Amazon for quite cheap ($200-600 USD) whereas the the cheapest manual mini mills seem to be roughly 400-1000+ USD. My question is why the cheapest CNC mills cost less than the cheapest manual mini mills? (I am presuming the entry level for manual and CNC mills are the same except obviously the key automated part --- ie that RPM, vibration, stability are similar, but please comment on that in your answer if that's a confounding variable).
EDIT: My question originally had two parts with the second asking if there was also a performance difference between entry level CNC and entry level manual mills, but since none of the answers addressed that in much detail and it's sort of a separate (but only possibly related) question I have removed it.