Bojack,
To some $400.00 is a days wage and to others pocket change and still to others a weeks wage and so on.
If you list your system and price paid I can then go through it and see if you are a fool or not.
Your statement is meaningless regarding the fool who is willing to paying $400.00 for a pair of tubes.
As for as the scam artist statement is concerned I pity your wife or close friends as you are to black and white in your thinking.