In my opinion, and seeing the small progress pics coupled with the parts-inventory and of course for the sake of being a "scale-model-enthusiast" -- it's money well spent. A turbo could very well make your current car faster, a new car would be - hell! a new car, some other stuff you could buy with $1,400 would be worth $1,400 -- but this model, which seems to be something Supercarfreak is apt on making, and keeping -- could be worth more than $1,400 in intangible money to him.
So let's leave him be, sit back, and be with him during his progress on the kit.
"i love the smell of primer in the morning..."