That means you would have 1900 dollars in product that you would have to refill 380 times to break even (minus the shipping costs each time).

也就是说你花了1900块买了这罐蜡，而你必须要回填装满380次才能够回本（扣掉每次的运费）。

youdao

Net shipping costs what Amazon pays to ship stuff minus the amount it collects from customers who pay for shipping rose to 3.9% of sales during the first three quarters of this year, up from 3.3% a year earlier.

FORBES: Amazon Has A Fat Market Cap But Razor Thin Margins