Doesn't make sense if you plan on getting rid of it no. But if you plan on keeping it is is much much cheaper than buying new spread over the additional miles service you will get. Fleet users routinely do repairs on high mileage vehicles. The companies my wife and work for run fleets of Ford E-350 vans, and neither company would even blink at replacing and engine or a transmission in a van with 300,000+ miles on it because a $2,000 rebuilt transmission will get us another couple hundred thousand miles out of a van. A new one, not counting cost of installing our specialized equipment, will run $40,000 plus. My company just put a transmission in a 2003 van with 350,000 miles on it because they hope to get at least another 100,000 miles and 3 years out of it.