I attended the auction this weekend; 3 XK8's (no 'R's) went across the auction block. Following are the sale prices (include 10% buyer's premium).
Click on links for photos & additional details; the first one had accident damage reported.

Lot 317 - 1997 JAGUAR XK8 CONVERTIBLE
Friday - April 13, 2018
$11,000.00 * Classic convertible, green exterior with tan leather interior, 33,000 actual miles. 4.0-liter V8 engine and an automatic transmission. Premium sound, premium wheels, power windows, doors and seats, ABS, air conditioning, traction control.

Lot 992 - 2001 JAGUAR XK8 CONVERTIBLE
Sunday - April 15, 2018
$15,950.00 * Beautiful Jaguar XK8 convertible finished in Roman Bronze with Oyster leather interior. Powered by a 4.0-liter V8 engine mated to an automatic transmission. 57,316 actual miles.

Lot 997 - 2001 JAGUAR XK8 CONVERTIBLE
Sunday - April 15, 2018
$12,100.00 * This convertible is powered by a 4-liter V8 engine backed by an automatic transmission. It has an accident-free CARFAX.

 

I have to say one thing that they all have in common seems the clean interiors. Seems as if there has been no wear and tear on the seats. There also doesn't seem to be any mention about mechanical upgrades, timing chain tensioners, water pumps, etc. It appears prices are holding.

 

Great info, thanks for posting!

 

There are several opportunities for sellers and potential bidders to meet for questions prior to it going across the auction block – right up to the last minute. I find that most of the enjoyment of attending the event is not so much watching the auctions, but rather strolling through the humongous tents out back in which the hundreds of cars are on display – both before and after they’re sold. The sold ones show the sales prices. Here you can get close-up looks, kick the tires, etc. Often the cars are unlocked. Two years ago William Shatner was there auctioning his Aston DB-7 and Volkswagen Phaeton. Imagine my joy as a dyed-in-the-wool ‘Trekkie’ to be able to sit in Captain Kirk’s Aston Martin! This year Burt Reynolds was there auctioning his 1980 Pontiac Trans Am Indy Pace Car, which sold for $110,000.