NSR technology is now 20 years old. Today's youth are not exposed to 2-stroke technology like they were 20 years ago. Heck, even dirt bikes are now 4-stroke. 10-20 years from now there will be no one interested in old and unfamiliar technology. Repair parts and shops will be harder and harder to find. And values will plummet unless you have a museum quality piece.

Many (most?) NSR owners either grew up with them, or longed for them in their youth. Many (most?) self-perform repairs as the cost to hire someone to do it would not make economic sense.

Take the cost to buy one in the $4-$7K USD range, add in tools and parts for a complete top to bottom rebuild and you've spent almost as much as a new CBR1000RR. And your labor is free.

My point: It is a labor of love. It has no economic sense to it. If all you wanted was to go fast on a motorcycle there are multiple options that cost less and perform better.
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MC21R9N track
MC18R2J track
CBR954
CR250