There is an off chance that he no longer owns the name, however I will explain to you what is more likely the case.
Regardless if it is a domain name, a car or a home, anytime someone arrives and simply pays the asking price without haggling you are asking for serious trouble.
Psychologically many people will start thinking "wait, if he paid me what I asked he would of paid way more, I am not selling it at this price". People also have friends and family they talk too, the advice they get from these experts is a mix of jealousy and over protectiveness, upon this poor souls announcement that someone paid his asking price without even talking to him first, these experts tell him right away, "WOW you sold for so cheap? You are getting robbed! Don't do it, go look online people are paying billions for domains that are not as good as yours".
ALWAYS haggle, not just because you might save money but also because if you show up and pay an asking price the guy will have sellers remorse and you will end up in the situation that you are in.
When you haggle the guy feels he won if he gets the asking price or close to it.
Amateur real estate brokers representing sellers get screwed all the time by not understanding this. They call their seller that is asking $300k for his house, they show the house then report back that the potential buyer might offer the asking or close to it, the seller is happy he jumps up and down. However, 30 minutes later the realtor gets a call from a very angry seller, the call might sound like this; "I thought you are looking out for me, I just spoke to my wife/husband, sister, brother, father in law, google etc. and know for a fact I can get way way more for this house, I won't let these buyers rob me blind". Mind you the seller has been trying to sell his house for years.
Guys I am serious, this is a real issue, A VERY serious issue, I won't even go into all the problems these mental cases create for many people across many industries.
If this wasn't common I would't bother posting this.
Disclaimer: Given we live in an Politically Correct era I must say that most people are fine wonderful people, they are honorable and their word is a word. Unfortunately 1 in 7 billion happen to be not honorable, sorry to hear that you have met that 1 person.