I have to agree with the OP. Exchanges are a very bad way to set the price. Yes gold, shares and other things use exchanges, but BTC is a currency. Imagine if pizza was sold on exchanges? It would cause havoc to the price with margin trading etc.
Aren't you aware that all currencies are sold on exchanges?
Also, pizza may not be sold on exchanges, but corn, soybeans, soy products, wheat, pork, cattle, butter, milk, cocoa, coffee, cotton, orange juice, sugar, crude oil, heating oil, diesel, refined petroleum products, gasoline, electric power, coal, natural gas, copper, aluminium, lead, zinc, nickel, tin, steel, gold, silver, platinum, and palladium are.