I have seen in this thread people comparing prepared food to raw food. And, of course, raw food is cheaper. You need to compare apples to apples. Prepared healthy food is way more expensive than junk food.

Healthy diet costs three times that of junk food https://www.telegraph.co.uk/news/11149644/Healthy-diet-costs...

I hope that his answers your question and we can talk about the rest of the points. :)