Typically cars that hold up well (reliability) regardless of whether or not it's real, or perceived, have a better re-sale value. This is why I bought my 92 over a decade ago barely 5 yrs old w/ 60,000 miles for $20k+ off the sticker price. This is why honda's, toyota's, etc typically hold up better in the used market. If you don't believe me go buy a new taurus, and a new camry, and see which is worth more in 3 yrs.
I'm by no means saying the SHO is a pile of junk (it's a very fun car, and IMHO probably the easiest car on the planet to track at 10/10ths), but I'm not going to tell somebody looking to buy one it's a super reliable car. Some parts are reasonable, some are pricey, most drivetrain related ones you can't get, and if you don't do your own work I can assure you nobody is going to want to put up with shop bills for a (now the 89's are pushing 20 yrs old) 15+ yr old SHO for very long. I've owned my SHO the longest of my current fleet, but if you take the average repair cost of any given year, I always have spent the most on the SHO to keep it in top shape.
Due to the limited performance market, the SHO is not a cheap car to modify. This isn't because it's a bad car, simply not as much market competition and small runs of custom parts being made. I don't think you can argue this if you've priced aftermarket parts for mustangs, C5/C6 corvette's, F-body's, imports, etc.
I'm a die hard SHO fan, but you'll never hear me say it's a cheap car to keep running in top shape or modify.
