I think they'll have a hard time getting that type of money. TR4s are still very undervalued, and probably never will have the wide-appeal to gain huge multipliers on FIA cars. From the vintage racers' point of view, the TR4 is an "entry-level" car, and not at all prestigous. Which, I suppose is great, since it's the most likely car for me when I start vintage racing in about two years.
The TR4 wasn't a real stand-out FIA racer, but I'd still love to have that car...it would qualify for the Monterey Historics.