If you take that to a logical extreme (and humans do take things to logical extremes... ) it becomes a game more about electronics intelligence (jamming, jam evasion, cryptography, steganography... ) which, don't get me wrong, would be amazingly amusing to watch if you even could watch it, but would devalue the relative contributions of the card players and would put more emphasis on having money for equipment and the salaries of specialists.

You could fix that by making sure every team has the same budget and watching the financials closely to ensure nobody goes even one cent over, which should once again move the competition into the realm of being mind against mind instead of checkbook against checkbook. For added fun, make all purchases and hiring decisions (and make sure all team members are hired and salaried out of the total budget) public information, so each team can fret about what every other team just spent money on and why and how all those things can be used and which are decoys and which decoys are actually useful and we should buy that decoy and...