Majatek has written
inb4 "account trading", the resultant flamewars, and then the thread ending in a lock and everyone who flamed getting a tempban.
Honestly who the fuck cares. It's an ID/number that simply makes organization easier with userposts and site data. There's nothing technically better having a number like "100,000" as your account's number, unless you're a kid and you must overcompensate by comparing your account's number to everyone else.
Madness I tell you.