Weird post when not considering what is normal and what is not.
You really should do more research and analytics before posting something w/no comparisons at all.
So, what is normal?
100% of any TLD will never be built out as its own brand.
Are the Top 30 dot com sales all still for sale? all not resolving? How many of those are developed, etc?
Nobody knows what is normal and what is not normal when analyzing only (1) TLD based on your partial post here.
Now try the Top 30 highest reported dot com domain sales, See where they go now.
Then try the Top 30 highest reported dot net domain sales. See where they go now.
Then try the Top 30 highest reported dot org domain sales. See where they go now.
Get more in depth for a more accurate ratio of normal to not normal.
Try the Top 30 your favorite ccTLD.
Then try the Top 30 of your favorite newG TLD's.
Then you can make some comparison analytics, find out what is normal and what is not normal for which top selling domains are developed, still for sale, or not resolving.
I made it a little bit easier for you here out of my own curiosity.
So out of the Top 10 highest domain sales ever.
http://domainnamesmatter.com/2017/04/top-10-domain-sales-ever/
Because they are between $9.5 Million and $35.6 Million dollars. Of course they are all dot com.
So out of these Monster $10 Million + Sales, (the biggest we have ever seen reported), only 7 out of 10 are developed and are being used as their own brand.
(2) are redirects and
(1) is a silly GoDaddy Parked page.
Here you go...
1) Insurance.com $35.6 million in 2010
Developed
2) VacationRentals.com $35 million in 2007
Developed
3) PrivateJet.com $30.18 million in 2012
Redirects to
https://www.flyvictor.com/en-us/#/
4) Internet.com $18 million in 2009
Developed
5) 360.com $17 million in 2015
Redirects to
https://www.360totalsecurity.com/
6) Insure.com $16 million in 2009
Developed
7) Fund.com 2008 £9.99 million
Nothing - Just a GoDaddy Parking Page...lol
8) Sex.com for $14 million in November 2014
Developed
9) Hotels.com $11 million in 2001
Developed
10) Porn.com 2007 $9.5 million
Developed
So someone spent $30.6 million for a redirect
Someone else spent $17 Million for a redirect.
Someone else spent £9.99 million to do nothing with it.
$200 Million total spent of Top 10 sales ever, and only 70% that were truly developed as their own brand
.