They know more about their demographics then we'll ever find out, most likely, and that has everything to do with the trim levels. So consider Nissan's decision, or any manufacturer, is based off of that first as they need to actually sell the car first and foremost. It's not that they don't know it will make a massive difference, it's that the people buying it don't really give a shit enough to demand it.
And these were the prices of the Japanese muscle cars of the 90's. Considering inflation, all the modern safety standards in electronics and physical design, current costs of anything on the global market and every other variable you're looking at a car that weighs quite similarly to the 300zx and dramatically outperforms it (presumably) and is (maybe) more reliable and (certainly) safer.
Just throwing it out there, btw, but the 300zx in 94 cost upwards of $50k in the final year and would cost $97,000 right now. So this is a fucking bargain at $50k with what it's bringing to the table.
Edit: median household income has also gone from $34k in 94 to $80k in 21. Consider the cost at the time for both in relation to that. Huge difference