For most of Canada this only applies to packages UNDER 500 grams.
Customs costs are borne by the USA not CP
Their are similar glitches in the USA, it's cheaper to send a 250 gram package to Japan from Canada then from the USA.
USA/International Small Packets are a "subsidized" service (well sort of) don't complain too loudly or they will take it away.

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.