Extended warranty

I have a 2002 M5 with 48000 miles on it. It will come off warranty in 2000 miles. It has a fair amount of road rash on the front clip. I plan to replace the car in another year. A BMW warranty for two years and 100,000 miles costs $3800.00. I got an estimate to repair the stone chips for $1400.00. My dealer tells me if I do both the resale on the car will be higher but they can't tell me how much higher it will be. Any thoughts?