Better? You mean slower, and the same as all other Trophys? I know what you're saying but shouldn't we praise people for doing something different? Maybe if the price was £5.5k you'd think differently?
How come? At the end of the day it's just a cheap, French hot hatch. I know the Trophy is a limited edition and command a premium over regular 182s, but people modify standard 182s with a t/c or s/c and I've seen plenty which are more rare than a Trophy - take the Petrol Blue s/c 182, for example - only 29 made in that colour iirc.
Not everyone buys a Trophy to keep it a pristine garage queen, some drive it, enjoy it, and feel the chassis and handling is capable of taking an extra chunk of power. It's a special car, why not make it even more so?
As for trying to recoup your expenditure with a massive sale price, I'm not convinced that's the way forward...