Everytime I saw someone go for it, it was always something good. But I heard the Mystery Money could go as low as anywhere from $1 to $99.
I do know that's been passed off as fact, but did it ever get to that point? I don't really remember seeing one of those single or two digit cash amounts on the Mystery Money.
(maybe it never did, like those who risked their Winner's Board winnings for the shot at fifty grand...which still baffles me, if only from the standpoint of taking such a great risk for a shot an a cash bonus had a 100% success rate)