There are many good, viable reasons to buy a new car whether it be a 370 or anything else. However, buying a new car of any make is NEVER a smart financial decision...even exotics depreciate; at least until they become truly collectible but even then, the amount of the purchase price put into a good stock portfolio held over the same number of years is a better bet (even in today's economy).
New cars drop in value like a rock...put the anecdotal stories aside and you'll find that all new cars drop in value 35-40% in the first two years of ownership. Claiming one particular make or model is "better" than another is window dressing and rationalization and ignoring that fact that you are loosing your shirt when it comes to depreciation no matter what you drive.
If you've got the money; buy what you like when you want to buy it; if you don't then don't and if the amount of depreciation is really going to keep you up at night then you probably should consider buying a used vehicle.
