Its not just on shipping. I take out on paypal fees, plus I charge a little extra just to be safe as every shipment has a different price (I don't use the prepaid boxes). That safety barrier distance is also used for insurance/warranty coverage so I can afford to need to do work on and reship units out. I can change the actual prices of the loadbox to account for that, but the FINAL price will still be the same.
So in reality the loadbox is really $175. The $160 is a subtotal, and the final price consolidates shipping, handling (cost of packaging and paypal fees), warrantee and a $1 to $2 buffer. I could eliminate that, but my local shipping is $24 and you would not get any warrantee.
If anybody wants, I can "update" the pricing (or wording) to reflect where the final price comes from.