Right, but the parent comment was questioning the widsom of installing the hardware in every car. My point is the pricing model is that people using the software pay for it. The price of putting the hardware in the cars is probably low, and also Tesla probably benefit from the data gathered by that hardware anyway.

Tldr: I suspect Tesla know what they're doing with the pricing of this thing.

It's wrong because the marginal cost of adding another unit to a car has nothing to do with r&d.

In the choice between putting the hardware on all cars vs only on a few prototypes, the R&D is a sunk cost that shouldn't influence the decision and only the pure incremental cost of the hardware matters.