Although the topic of this tweet is interesting I also want to draw attention to how Jack from dn.com markets his domains.
Notice how he inserts his domain names onto the picture of the tweet to promote them while conversing about a completely different sale.
I've watched Jack (not his real name) from the time he was selling dn.com to when he decided to use it as the base for his business. He is a very active domainer and has had some incredible sales.