I have numerous domains at Parked.com and some of them are starting to show some minor search traffic (minor meaning 1 or 2 a day. They've been parked for about a week.), but the traffic analysis page on Parked.com shows that no data is found for the time period. Any ideas if they don't show you data until you get a specific number of hits?
Most parking websites offer the same statistics behavior and very little income overtime because the good old days when they were source of nasty amounts of money has gone... unless you have a truly premium domain
Your best bet is to develop your domains into mini-websites and monetize them through the various ad/ppc networks. Parking payout rates have been in decline for at least 2 years. The deep recession we are in only makes the situation worse.