I think this whole article is little misleading. That 53% original price for car with Nav unit is still higher than 55% price of the car without it.
First of all I don't recall my TCH Nav system was $2000 option, more like $1300????
Second of all factory Nav units are ripoff, way overpriced, like most dealer options. They should cost no more than $1000.
3 people who buy used cars are usually looking for quality, INEXPENSIVE cars and since you can buy portable navigation system for less than $500, I can see why somebody on the tight budget wouldn't want to pay extra money for Nav. system and spend that extra cash on lower millage car instead.
Electronic gadgets are one of the fastest depreciating items, if you don't believe me try to sell 1 year old computer for 50% of price you paid.
I have both factory and portable navigation system and use both extensively and can't imagine driving without one, but if I was going to buy new car, it would be with factory Nav for sure, regardless.