Everybody wants validation, and on the internet everyone thinks they are some sort of celebrity and are worth knowing about. Stats are just a quantifiable thing that they can lord over others with fewer stats making themselves feel, in a rather weak way, superior.
It is somewhat related to the way people act in a group. Each individual has a trait or skill that they have unique to the group they are in, they will use this skill to set themselves apart from the others. This could be anything from a stupid trick, to their job/income/possessions, to their knowledge of useful/useless information, the list goes on. Each individual will try to find at least ONE thing that they have better/more of/unique to the others in the group, something special that they can bring to the table that makes them just a tad bit more special in one aspect. And since on the internet its difficult to prove any of those normal traits, people rely on stats to fill in for their absence.