Rick Schwartz, the Domain King, is constantly buying but also dropping domain names all the time.
He shared a list of his purchases and also tweeted today that he dropped 100 domains from 1997 saving him $8,000:
“I dropped about 100
#Domains that I have had frm 1997 & don’t see it having value. $8000 over 10 years in fees. So bought 2 more #bitcoins”
The main point here is that you should always re-evaluate your portfolio. I dropped many New gTLDs saving a lot of money if future renewals. I also count my dropped domains as savings of 10 times the yearly renewal of each domain.
Here are some of his 2016 and 2017 acquisitions: