Full-proof idea:
Send your wife to Mrs. AJK for a "tutorial."
She'll come back bloodied, bruised, indoctrinated, and malleable. She'll also come back with dozens of new credit cards all of which will be used sparingly and with great discretion.
...all for the low, low, introductory, one-time price of $999.99, payable in 12 monthly installments, 0% interest for the first 90 days.