Bang for the buck的Wiki解释:
Bang for the buck is an idiom meaning the worth of one's money or exertion. The phrase originated from the slang usage of the words "bang" which means "excitement" and "buck" which means "money".[1] Variations of the term include more bang for the buck and bigger bang for the buck. "More bang for the buck" was preceded by "more bounce for the ounce", an advertising slogan used in 1950 to market the carbonated soft drink Pepsi.
这里的用法我的理解是物有所值的意思。