The greatest is that these Asian sports cars are often hard to find in good condition. Most rusted out in many non dry areas.
They often had technology and parts that were difficult and expensive to repair vs the value of the car.
Then NOS or reproduction parts are non existent for many of these models.
The very early Z cars will hold some special value if they are in good and or near original condition.
As for the 911 air cooled. It is a cult to itself. Parts are not rare and often the value makes them worth the investment. They also are easy to work on.
If you can work on a VW Bug you could become a good 911 air cooled mechanic.
The water cooled 911 is much like the Asian sports cars. A great car but tech and more expense will hinder them from being easily restored.
To restore most of these cars anymore you do it for the love not the investment. That way if it is not worth a thing you have a car you treasure.
"I wish Hagerty would advice its readers (we're all not Rockerfeller) about how to get into the Hobby without sacrificing your first born."
Kinda seems like that's exactly what this article just did. It makes a valid comparison of value growth between Porsche 911 and Nissan/Datsun Z cars. Should it have been more explicit to tell readers that 280zx and 300zx are still out there for relatively cheap prices, with enough room to be good buys with plenty of potential growth in value? I think that's probably asking a bit too much, but if you read between the lines and do a bit of your own research (as anyone looking into buying any car should), there's plenty out there to make it evident, and it will tell you that 280zx and 300zx are still bargains generally in terms of getting a vintage, quality, enthusiast level, sports car.