Car options are priced independently from what they actually cost to manufacture. A cheap luxury car will often include a host of features that cost quite a bit when you added as features to a lower end car. And sometimes it’s the reverse where missing features in luxury cars ends up being almost as expensive as the cheap cars they come standard in.

It’s a combination of price discrimination and the overhead of having multiple different specs being manufactured independently of whatever the actual differences are.

> at least without some DIY aspect.

Solar car battery chargers already exist for less than 30$. I’m assuming the overhead of including it into the cars design and modifying body panels etc significantly increases costs. But it’s the kind of thing Subaru could add to every car for diversification without significantly impacting final price.