Anyone with an ounce of common sense would have sensed that this demand was fishy—not to mention Jake, who knew for sure that Cho Min Ho had a mole in the enemy camp. This stipulation was specifically designed to keep him from controlling the circumstances of each duel, preventing him from strategizing ahead.
It was a clever idea, as expected from their adversary, but unfortunately not without flaws. Ultimately, the King's Idol Alliance and the Myrtharian Nerds were part of the same Mirror Universe. If they purposely threw their matches, their performance would be seen as sabotage against their own side, or at the very least as friendly fire by the Oracle System, and their Ordeal rating would take a hit.