It's called Bank alts. I had 3 characters above lvl 10 and myriad of under lvl 10 chars, as either sonds on other realms to chat with people (pvp arena related) or bank alts. This article is pretty much worthless.
MY HYPE LIST: 1) Gran Turismo 5; 2) Civilization V; 3) Starcraft II; 4) The Last Guardian; 5) Metal Gear Solid: Rising