As a balding man, I object to the notion that a person with a hairless skull needs a giant suit of green and purple power armor to be a productive member of superhuman society in DC Universe Online.
Lex has spent decades battling Superman to a standstill through sheer intelligence and cunning, but I guess that doesn't translate well in an action-packed massively multiplayer online game. Cunning Man wouldn't last two seconds once the cars start flying. Cunning Man in gigantic purple and green suit of power armor, on the other hand, fits right in.
And yes, I realize that Lex has worn a similar outfit in the comics, but it's never made him look so much like he's the world's greatest StarCraft II cosplayer before.