My time allocation will result in mileage quite similar to Thomas' 900 per year; for me that will be about 1500 miles per year.
I have to weigh in 30k miles per year in two family cars (without leaving the City), kids' transportation needs which requires 4+ seats, and my career.
This leaves the Viper as a brief, ride, mid-week, and some use on weekends, but even this is vulnerable to vagaries of the kids' increasingly complex schedules.
On the positive side, each ride is the experience of a new car.