that has nothing to do with pr, if it has enough backlinks, it'll have PR for sure lol, a domain with no site can have a PR too, but it wont show valid in some checkers if its not indexed or have content
You should not worry about having pagerank on that domain, i would actually more care to have traffic on a parked domain.
not if you want to sell it for profit later lol, PR domain sells high, so does traffic but i doubt more than PR, both together are excellent lol