The following assumes that everyone in your household will still have food in the house to eat after the purchase …...
1. The price is way cheaper if you think of it in English pounds, makes it look better
2. If you are playing it, you aren't getting in your wife's way but she will always know where you are (which is generally a good thing)
3. And you will be increasing your brain capacity through playing different guitars so avoiding slipping into early senility (essential health care)
4. That colour scheme will match anything in the house and, indeed, will make you look way posher than your neighbours
5. If the fabled bus of doom were to run you over tomorrow, she would feel terrible she denied you this last moment of happiness
Need I go on?