Naah. My father-in-law has done this for years now. He has had his current car for 5 years and it's still fine. He'll have it another year and a half. (He's retiring then.)The break-even point is 1,750 miles. Anything over that and option 1 pays more, under and option 2 pays more. If you want to maximize your earnings you would have to keep it between 1,300 - 1,750 miles/month.
My wife used to do 30k+ miles a year for her job. All I can say is, save that money. You'll be doing a lot of maintenance and buying a new car every 5 years.