Who the f*** would take these bets? Seriously? Who?
People who realize that the bet is close to a 50-50 split:
On the one hand, people who know that Valve have quite the troll-streak, and back-referencing "cake", even if the reference is hidden away, is a possibility.
On the other hand, people who know that Valve are smart enough to know not to use a stale reference that has done it's rounds on the internet and has been spammed to hell and back.
...
My money is on option a), but it has more to do with me being quite partial to trolling. XD