Not sure I'd give them credit for big balls as much as no brains. I guess if you're a chronic liar and cheat you just can't help it.
On a somewhat related note, I lost heaviest fish on the boat on a blue fish trip several years ago, all legit and I still tip my rod to the winner. The weigh in came down to mine and one other blue and on the weight scale they were virtually tied. So the fish went to the balance beam scale and hung one fish from each side. The other fish won ever so slightly. The disappointing part for me was that when I landed my fish, as it flopped around the deck, it spit up about half a dozen little butter fish, surely enough to have tipped the scale in my favor. But hey, all was fair and square, still had a great outing.