USPS limits insurance to $50 to Canada?

[KrazyIvan]

So I am trying to figure out if this the USPS official stance or if it was some sort of system error. I was unable to purchase additional insurance for shipping to Canada. I needed $150 of insurance, couldn't get it, so I went to my USPS office. The same thing happened. They could not add the additional insurance even after a supervisor came and tried the transaction. They told me that it is because the contracting country (Canada in this case) would not accept the additional coverage. Has anyone run into this?