Some of the homologation special cars can fetch good money if they are very low miles, unmodified and and in excellent condition. For example a Lancia Delta S4 Stradale fetched 1 million euros in 2019. This Sierra Cosworth while not a very limited production car appears to be unmodified, low miles and very clean so it might sell for that, if offered at some international auction.
I find youngtimers way more interesting and appealing than most 2025 cars. But somehow it's odd that turbocharged engined olders cars are now worth gold. Naturally aspirated engines are getting very scarce, so you'd think they would have the highest value?
People now seem to pay way more money for sportscars / supercars without turbos, than for the models that are turbocharged. F40 seems to be an exception. Ferrari at them moment has a serious resale value problem with their overcomplicated hybrid turbo models.
