Instructions are one of utmost things to read before creating accounts or playing.
So, you recommended valueable, and right things who have interests to join the Challenge above.
It seems that gamblers should do opposite bets in mirror of decimal places, not sure that will increase odds to win the challenge.
A friendly warning to everyone, if you're gonna hunt for this challenge, make sure to read all instructions (even the hidden ones, they are the most important!). I noticed that some who already posted in the thread haven't read the instructions carefully. They simply just hunted for 73.xx and xx.73, but it should be as I quote above.