It's not that funny, he created the thread with intention to sticking with the favorites and he knows very well that favorites aren't performing any good in this World Cup, but again he didn't change his mind, and is continuing to place his bets on favorites.
If I'm not wrong, his idea was not to make profit or lose but to stick with the favorites no matter if there will be losses or wins, and it's more like an experiment where he's taking risk to let others know via this thread that what could be the result if someone sticks with favorites.
You are right and that is how some fans are, they stick with their favourites no matter what the outcome might be, they don't care and they don't switch either, they just remain where they are giving out the best support and even if they bet, they don't do it for profit or loss but for the fun and to make sure they don't lose their hope, as they believe there can still be a turnaround. So you are right, its not funny though because they have their own agenda of acting their way even when they are aware that their favourites might meet their expectations.