Well, remember how you got your contract? 
So comparing to what you have is not apples to oranges, to be fair...
Really you can ship 7kg from China to USA for $30 usd ? Nice! But how long does it take though?
I can ship for $6 per kg UPS but it takes 7 days. The fastest service is more expensive but it only 2-3 days.
Express International is usually 3-4 days. Quicker from Europe, but this is China.
As RockMiner develops further, maybe they can give multiple shipping carrier/options. then you can pick whatever shipping speed/method you want and pay accordingly. At the moment, however, it's DHL express, which is super fast.
DHL is the. Better shipper internationally. And their prices are usually in line with FedEx and ups. These guys just have a lousy contract.
So comparing to what you have is not apples to oranges, to be fair...
I went to go buy 4 rocket boxes today but the 450 dollar shipping on them turned me away 
That's ridiculous. They are eitHer taking a profit or paying retail. My FedEx acct would be $25-30 per. Really you can ship 7kg from China to USA for $30 usd ? Nice! But how long does it take though?
I can ship for $6 per kg UPS but it takes 7 days. The fastest service is more expensive but it only 2-3 days.
Express International is usually 3-4 days. Quicker from Europe, but this is China.