peanut butter and oatmeal as survival food?

I'm prepping a little 3 month stock in case there is a sudden quarantine. But I'm on a budget.

To my surprise, according to my calculations, just buying a bunch of peanut butter, oatmeal, coconut oil, and sugar seems to be the cheapest most cost effective way to get calories n protein.

1 cup of oats, 2 tablespoons of peanut butter, 1 tablespoon of coconut oil, 1 teaspoon of sugar = 17 grams of 'complete' protein, 600 calories, and 50 percent of my daily fat intake.

thing is... I can buy 15 servings of this for 3.50. 1 dollar for a jar of pb and 2.50 for the oatmeal. I already have the sugar n coconut oil n cinnamon n salt n stuff.

So... for 90 days... I just need 6 jars of pb and 6 cannisters of oatmeal..... which is less than twenty bucks.

So... in absolute WORST case scenario. Total quarantine for three months...

If I drop forty bucks on oatmeal and peanut butter... I could be getting by on 1200 calories a day, 34 grams of protein, plenty of fat.

Seems like a good 'base' to start with for my prep.

I'm posting this on here because I rarely see an emphasis put on peanut butter and oatmeal. Is there something I'm missing? Some reason not to start my prep by dropping 40 bucks on oatmeal n pb?