Hi Usopp. Allow me to add my welcome to WebmasterWorld.
While I can understand your frustration the number of folks that have registered domains for future use/projects is legion.
Many of those folks will either 301 their domains or park them, pending (further) development, to recoup a part of the annual renewal fees.
I see parking platforms -> ~development, at least early stage, as many topical domains, when developed, start off with links to relevant/related sites ~directory sites. Parking platforms also allow for relevant content to be inserted, etc.
You might want to take a look at the Domain Forum Charter
[webmasterworld.com], with specific reference to the part about disparaging widely adopted industry practices - such as domain parking. Since it's been awhile (years?) since anyone dropped by to state their grievances about "parked domains" I've let your post stand . . a bit like a trip down memory lane to a time, about 8-10 years ago, when complaints such as your's were more commonplace. Now, the vast majority of folks just see domain parking as a reality and move on to their next domain choice.
Still, allow me to say "I feel you pain", in the sense that there's more than a few domains I'd like to have/register for my gain/advantage
that have long ago been registered by others. There's probably no WebmasterWorld member that wouldn't like to have a domain like . . CreditCards.com . . Loans.com . . Mortgage.com . . Drugs.com . . (City)Hotels.com . . and the millions of other domains that other people go to first.