My mom had an Escort of that era and couldn’t stand it any more after two years. She even admitted preferring the Renault Alliance the Escort replaced, and it was constantly breaking down. So 500,000 miles in an Escort sounds like as much fun as self-flagellation.
There are so many more interesting cars in the world that wouldn’t cost any more to own, though I suppose after all those miles you know the history of every part and there would be fewer surprises than with your typical high-mileage vehicle. Too bad they no longer sell the Escort or you’d be perfect for one of those ads with people and their amazingly long-lived cars.