Mine has 107k. Engine replaced at 95k due to head gasket.
I think the head gasket issue is the only real concern and that's only for gen1 cars.
That's about a $2k job.
With low miles cars, keep in mind that some guys will pay considerably more for a very low miles Viper.
Since the cars are very reliable, the only thing you are really getting for the low miles is a small number on the odometer. The very low miles car isn't really going to run any better or have fewer problems.
So, if you pay a premium for a 5k miles car, and you drive it very often, the car will soon be just another Viper with average miles.
I'd say the very low miles cars are worth more but only to someone who intends to use it little and keep it low miles.
Vettes seem to run 150k miles in normal use without any serious problems.
I think a Viper would probably do about the same.