Everyone with an iphone is paying at least $840 a year for the privilege of using it, and if all you wanted was cell phone service you could pay half that.
Lets review a few things:
1) Standalone GPS units cost less than $99 today with interfaces similar to the TomTom software and they won't tie up your iPhone while navigating.
2) The hardware itself is far more expensive than it should be given the price point of standalone TomTom GPS hardware. I bought a TomTom GO 730 for about $139 brand new.
3) The Google Maps turn by turn navigation really brings competition that shows just how overpriced these GPS solutions are.
Yes, I pay at least $840 per year for my iPhone that gives me enough functionality to almost call it a computer. The Google Maps navigation software will be included with it soon making it an even better value, but for now the TomTom solution is still overpriced compared to TomTom's own hardware offerings.