A 1990 acura nsx will still fetch a cool 30k today
in great condition, yea.
recently, I've seen 92-94's for under $20k with normal wear and tear for a 20+ yr old car.
even then, you're gonna spend less than a couple thousand per year on maintenance.
tires = less than $1k/yr, IF that.
oil changes = less than $400/year.
MAYBE headlight motors, window motors, and brakes every couple years.
the NSX and 911's are the best sports cars you can by in terms of value & reliability, IMO.