I agree with Ganzoom here, I recently bought my IS premier, for what seemed like an obscene amount, more than double the price of any other car I have ever purchased, we had the choice of investing the money in another flat to rent or buy the car, the car won!
I justified it as I work 60-70 hours a week, had 2 days of in the last 4 years, and use the car for work, it will save me a £1000 a year in fuel costs, and thought it was time we treated ourselves.
I will probably run this car for 8- 10 years, at the current rate putting on about 150-200k in that time, hopefully the car will take it, and compared with a "boring" car might have cost a couple of hundred pounds a year extra (just need to find some sensibly priced servicing!)