"However, I could have bought a brand new paper road atlas every year for the past 6 years, and still have change from one single Garmin map update."
In their defence, the road atlases you bought probably wouldn't give you the detailed change that the Garmin map update did. The equivalent analogy would be to buy every town's A-Z every year for the past 6 years. If they start spinning it like that, it might seem more of a bearable pill to swallow.
None of this is relevant though, as a) I agree its too expensive and b) the idea that "satnavs had caused more than £203m worth of damage to drivers on UK roads in the last year" is utter bollox - bad drivers caused it.