Warning: Gach box at your own risk.

It's a closed system, Bayesian logic does give you those odds. You know exactly how many cards there are (52), which ones will beat your hand, which ones you can draw that would make you win, and so forth. It is relatively difficult, but there are people who know those odds. With the Gold Boxes, you have no idea how many items there are, or how likely they are to come out. A lot less certainty there.

See? A reasonable person can deduce that this is a risky game to play. People played the game and lost. I don't see an issue here.