Parked page traffic trends?!

[05JM]

I'm interested in hearing about other people's experiences for comparison on a domain portfolio that's been parked. What types of annual revenue growth rate would you expect to see over the last 5 years for a large and constant set of domain names (e.g. the same 10,000 names over 5 years)? Would you expect to see a higher or lower growth rate in the last year?

Thanks!

Justin