Why was John Hancock's signature so large on the Declaration of Independence? Apparently, the reason was fairly simple:
Because Hancock was the first to sign, he did the sensible thing and put his name front and center. He was the leader of the Congress, after all. He didn't know his fellow patriots would sign their names on a smaller scale.The Story of John Hancock's Signature
So no, there was not a more "colorful" reason for it.
"Already long ago, from when we sold our vote to no man, the People have abdicated our duties; for the People who once upon a time handed out military command, high civil office, legions — everything, now restrains itself and anxiously hopes for just two things: bread and circuses" ~Juvenal