I'd like to try and get this interesting thread back on track.
I completely agree with you on this point, db.
Many domainers on NP and elsewhere have hundreds, thousands or more domains. It's obviously impossible to develop them all and many domains are handregged/purchased only for flipping or selling to end-users.
They're indeed absolutely nothing wrong with parking, as it can provide some well-needed cash to keep up with renewals and to finance other projects.
However I also think that all domainers should as much as possible try and develop some of their names.
Many NPers have developed brilliant websites, and I know that many of them (including me) are currently working hard to develop some of their domains. They're doing so at the same time as buying/selling names, parking some and often having other jobs too.
What slows down development can often be a lack of available funds. But you would expect that the "top domainers" who are often very wealthy and earn lots from parking, would be able to develop many more great websites than most "regular domainers", precisely because they have those funds.
It's indeed sad to see that some of these "top domainers" are just not interested in developing any of their great names.
I think it would give a much better reputation to the domaining industry if more of these well-known domainers were also involved of developing great websites, and possibly even setting up online businesses and creating jobs (just like Amazon did, despite what Rick is saying about them).