You tell her how much you win?
Of course, the downside of being non transparent is what someone famously said "My greatest fear when I die is that my wife will sell all of my stuff for what I said I paid."
That is not my greatest fear, however. Mine is that there is actually a God and St. Peter reads aloud my Google searches at the pearly gates. My only hope for getting in might be to outdraw him in high card.