Aside from the RC Evo (maybe will can tell you if theyve been running full boost, i dont know) the top cars in pro and club so far have had around 700 and 500 anyhow mate.
Ron K's R32 isnt big power (not much over 500 i hear) and he pisses club class, the Roger Clark Impreza is about 700bhp (its running a GT35), Norris has been running less than full boost, the Zen Impreza is about 700bhp, and hell, that Elise is about 350!

Power is impossible to govern without restrictors, and its total rubbish saying its all about power anyhow, its plain to see looking at some of the cars its not.
All restrictors do is force people to spent MENTAL money trying to get every last scrap of power from that restrictor size, so the gap between rich and poor would get wider, which surely is what you moaning about.

Being on road legal tyres means its only possible to put so much of that power down anyhow, so more begins to defy the point and ruin drivability, its not like they on slicks.

And people come to see the amazing cars, stopping them having mega power will make even less people go watch, and its not exactly the most exciting spectator sport as it is...