A well engineered Turbo engine is not a problem, you only have to see how many Saab's that have done big mileages with little or no trouble and some of those are pushing out big horse power.
The problem is a big turbo on a small engine is putting the cylinder pressures high all the time to give you the performance of a big engine and that with 20k mile oil changes is to much for the poor quality materials that are being used in the construction of these engines.
As has been said the cost of the fuel is often peoples biggest concern but in truth unless you are doing 25k or more a year is often less than the depreciation and servicing costs. Driving a V8 car 8 to 10k a year that just about to does 20mpg with little or no depreciation is a cheaper car to run and the engine should last many years due to it being under stressed.
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