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Repeated starting does kill the starter. After a start the car also produces a lot more emissions until the cat gets back up to temp. Probably 8-10 seconds on a car that was just running. Many delivery cars that are shut off at every stop will replace a starter every year or so. Unlikely that you will save $300 in fuel with this. It also depends on the starter- some will put up with lots while others die easily under normal use.
The other thing is bump starts are generally considered bad because they break the spring steel straps inside the pressure plate as they're not designed to take load in the opposite direction. A few of my customers are die-hard hyper-milers and I've replaced clutches for this reason. Second time I had a special clutch cover designed with stronger straps so they won't break. Unfortunately he's $1800 behind his fuel savings target having paid for 2 clutch jobs inside a year. If you bump start it in a higher gear and do it gently you will probably greatly reduce the chance of this expensive failure.
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