Again here, the company is trying to discourage small orders in favor of large ones. Of course, they build the shipping cost into their prices, making them less competitive. But if their price is close to or the same on something as another company that does charge shipping, you may have a winner there. Overall though, the more you buy from a company, the less the shipping and handling usually is as a percentage of the total order cost. If the company has a flat charge, that's especially important, because on small orders you might end up paying twice as much for the shipping as the item itself.
Some online vendors are honest and fair about how they charge for shipping.
Unfortunately, many companies are dishonest, ranging from exaggerating costs a bit to what I can only call outright fraud. Any object on the planet Jupiter would weigh many times what it does on Earth, due to the larger planet's increased gravitational pull. It seems that some companies that charge for shipping by the pound have warehouses on Jupiter, if you look at what they seem to think things weigh. The company's system added these up to come to an order total of 5 pounds. If the box weighed one pound even with the packing materials, I would be surprised.