UPS makes 6X as much as tax paid to punt an envelope over the border.
With the shipping they charge, it's almost 50% extra on the cost of the order. In comparison, I shipped US$9500 of solar batteries across the border last month and paid $170 to a reputable broker that actually had to do some work.
This is such a scam. They also make it as hard as possible for you do do your own custom clearance with border security. Though every time I do get a UPS shipment I'll tell them I'll self-clear it. It costs significantly less, but I having to drive 30 min to get it cleared is fairly painful depending on how much cost I'm trying to avoid.
So yeah, I suggest learning how to self-clear, even if it's just so UPS doesn't get that little bit more in scummy profits.