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The New Audi A3 Is Amess With In-Car Subscriptions
(www.motor1.com)
This is a most excellent place for technology news and articles.
It is far cheaper to produce a single trim with most of the features. Customization costs money. There is a reason Porsches are expensive.
Multiple seat types is literally buildings and lines they need to construct. It's a similar scales of economy concept like binning chips. Instead of multiple lines.
Even if that were true, that still means that everyone is paying for that one single trim, including all the optional features in it. By paying for the subscription, you’re just paying more money, not less.