Tuning cars is never looked at as an investment, as pddy stated above - it's a passion, not a money making business.
And as for your list jomor, where are Alfa on that list? Nowhere... so pddy took the challenge to get them there himself... using an engine at least half the size if not smaller in capacity than most in that list, and only using one blower.
OK so the body mods might not be to everyone's taste, personally I quite favour it - but that aside, look at the engine tuning he has achieved, even with other specialist's help. This is an achievement in itself. Big power gains cost big money, it follows a non linear curve. Who cares where he got his money from, it's his money he can do as he wants with it. Who's passion has never cost them a penny? I think some people have got jealous purely due to the fact pddy has had money to spend on his car. That's just sick, grow up.
I'm surprised due to the amount of threads on here regarding power gains with air filters & exhausts and "how can i make my car go faster" that this thread hasn't taken a more positive slant to be honest.
hey ppdy, how about doing a rwd/4x4 conversion - it must be more than possible with the AWD 147 in the pipeline, think of the potential there