From the sound of it, it is not that surprising ...
He owned both an XBox 360 and a PS3 which are two systems which have the most (as a percentage) cross platform games of any two consoles in the history of videogames. What this means is that each console was offering only a handful of worthwhile games in a year that is exclusive to that platform. If you have unlimited resources owning both systems may seem worthwhile, but if you don't it probably makes sense to sell one and devote that money towards something else ... The choice between the XBox 360 or PS3 to sell comes down to confidence in the system and the features of the system you actually use.