Dude, you realy got to chill out, I havent' said silvercans are duff, or pointelss and did say that one of my kids use them. And did say that silvercans can be a good indoor motor.
The fact is, most people race, for speed not how much it costs, cause if we all looked at how much we spend on it, it gets well expensive. I know for a fact that if I wanted to run silvercan, and competitively, it isn't cheap, as you got to try and pull all the weight out of your car, lightweight shells, free-rolling bearings, etc.