Your futures are different from cheap futures because the delivery targets of different futures contracts are different commodities. It can be understood that you are trading real goods in the future (at the time of delivery). Different goods have different values, so the prices will be different.

But cheap and expensive are also relative.

Mineral water, perhaps 10 yuan a bottle is more expensive. But for gold, one gram of 10 yuan is cheaper.

Therefore, judging whether the price of futures varieties is expensive or cheap needs to be analyzed according to the intrinsic value of the goods themselves.