Yeah, at this point its just stupid. People used to tell me "Its cheaper to eat out" (No, It was not, they were just lazy but this was also at least 15 years ago).
I did a full breakdown for what my Wife cooks to prove it to some friends and they basically ignored me because they didn't like being told that if you cook food yourself its cheaper as long as you are not a moron. You do have a "initial investment". If you only have $5 you can't buy $30 of ingredients to make a dozen meals. I get it if that is the case but don't tell me that a crockpot full of (good home made) chili is more expensive than that crappy subway sandwich you bought for ~$7. (again, that was a long time ago, I bet that same sub would be $13+ now).