The 17 sold for $57,750+ and had 21k miles. Not sure what you consider low mileage. Also had a trans replaced and was a press car used by multiple journos on and off track. History shows past press marketing cars always take a hit. Knowing this car had thousands of miles of abuse, it's no wonder it sold for such a figure. I wouldn't have thought the reserve was so low as I would have personally bought it. Rob was ready to move on and that car could have easily sold for 8k-10k more.
The 17 with 2,500 we sold new in 18. Car came with the rebate money of $12,500 and had a window of 98k. So roughly 76k all in. Bids with 5% fee was up to $66,675. I've since put private parties together to do a deal in the low 70's. Seller didn't lose much here.
As you state, some cars do sell for high prices, yet some sell for bargains as well.