PV is wildly expensive in the US.

Apparently you even need a permit from the grid operator for it.

Here in NL they come to your house a week after you call and your panels are up and connected in 4 hours or so.

Labor for anything is expensive in the US.

Parts/materials costs in contractor quotes are often padded so they aren't completely overshadowed by the labor portion. In any job where there's specialized knowledge or license restrictions (HVAC) or risk (walking on a roof), the floor for labor rates is usually 2-4x the materials cost.

But, the real issue is that almost nobody pays cash upfront for their solar install. Between incentives, loans, and/or predatory PPAs, the prices lose touch with reality. See healthcare, college tuition, housing prices, etc. for similar scenarios where credit or third-parties distort the market.

Residential is expensive anyway, larger installations are plenty viable. My town in a northern Michigan is installing solar to help stabilize the rates they offer (I pay about 11 cents per kWh).