I doubt they're making anything on shipping, fullinfusion.
To ship my laser back to CNI for repair, it cost me $160. CNI didn't charge me that, FedEx did. When RA_Pierce shipped his back, it cost him $175. Again, not CNI's charges, but the shipping company's charges.
$75 is probably CNI getting a bulk deal.
Companies like o-Like ship 'best effort, uninsured, slowest way' - so thats why shipping is so cheap with them. CNI doesn't want things going out uninsured or untracked (And neither would I.)
This is just what shipping to China costs, if you 'really want it to arrive'. Really. It does. This isn't CNI's fault. They can't do any better without getting reckless with the untracked , slow "packet" sort of shipping.
You could probably talk to them about using slower / less secure shipping. I know someone here did that and got a $45 quote (on a heavier order, I believe) - Talk to them and ask what the minimum is.