Happens on all platforms and in all industries.
It took me once a month to get relisted on Godaddy as they waited for the buyer.
Talk to a real estate agent, a car dealer or any sales person. The first few months they start they think they are already millionaires. People call, excited about some listing they saw, they swear they are definitely going to buy it, but soon they vanish. At first the salesperson might contiplate filing a mission person police report or maybe checking with the local hospitals, something must have happened, maybe they were kidnapped? Killed? Abducted by space aliens?
After a while you learn that some people get excited over things and as fast as they got excited, they lose interest. Happens in the personal relationship world too.
The solution is to make them pay right away or leave the domain listed until payment shows up. Imagine if when registering domains Godaddy and others said, ok, we will hold the name and wait a week for your payment, youd have a lot less names registered.
In real estate people know if they don't put a deposit down the house stays listed, it gets people to make moves.
If only the sales platforms rebuilt using sales techniques that get people to buy now vs the lame pages.
How many more names would a platform like dan sell if we were able to add words to a listing such as what other similar names sold for and search volume? Instead they got that traffic volume thing that rarely helps anyone, if not hurts for people who don't understand.
No other industry has such an inadequate sales process.