Number of previous owners is Critical. Fewer owners is Key. All else follows.
Original owners,, who paid full ticket usually take V good care, Second owners likewise to a similar degree, But by the time one is into the 4th owner , maintenance is sporadic at best. These cars require maintenance semi regularly.
Also when one buys a $40K (when New) car for $2000 or less there is rarely much love/respect involved.
A 'beater' gets beaten on :-)