Maintenance matters. You have to look at mileage in the context of how well and consistently the car was maintained.
Running 50,000 miles on a car where the initial and/or subsequent owners skipped initial fluid changes, used non-spec oil, skipped or delayed Inspections and basically ragged the car because they didn't plan to own it long - is far worse than 100,000 miles on a well-maintained car.
A lot of these cars have been through 3 or 4 owners by now. Some cheaped-out on the car - or could barely afford it and delayed maintenance. The intensity and regularity of maintenance tell you volumes about how the car was treated.