It's a great question lol, but I think it's a few factors that make the R35 the one people sell...
It's still a Nissan (matters to many despite not to me), very expensive to maintain, feels fairly slow in stock form, and lastly doesn't really feel exciting or exemplary when driving.
One guy...
So, interestingly enough, the R35 GTR has one of thr highest turn over rates of any car produced.
In Japan, within 1-2 years a majority of them were on their 2nd and sometimes even third owner.
I personally had three friends that owned then no longer than 2 years each. It was generally...
the order of magnitudes at which this project differs from perception of the public is definitely a thing... It's so different from what folks imagine and involves a lot of technology sharing vs dollar amounts as well (gross oversimplification).
the other thing I'll take a moment to correct is...
I didn't interpret it that way personally, but if something like that was on the table then I haven't heard about it and it would have to be the next gen 86 whenever that ends up happening (if it does).