I've never bought anything off the guy, but my experiences here make me believe that he's a troll par excellence.
He'd frequently tell anyone who owned an A1200/4000 that their machine was a "piece of crap" and to "buy an A2000, the flagship Amiga" before logging in under a pseudonym and asking something like "Can a CD-ROM be fitted to my flagship Amiga 2000?". He'd also log in under pseudonyms claiming to be a friend of Doommaster saying what a nice guy he was. Clearly, this chap has issues!
One or two of the Atari chaps joined here specially to swap notes on how to deal with him!