While it is a thing you can do for its own sake as it were then if funds are going to be an issue then it also serves as a really good isolation diet to figure out what common foodstuffs do not do well for you as you start to introduce things back in.
On cost itself then yeah it is a tricky one, especially at present even if you mix it up with some nice organ meats (your old thread is below as I am typing this
https://gbatemp.net/threads/do-you-eat-organ-meat.593481/ ) which you probably should be as muscle meats are tasty but ultimately lacking in a few things that organs have in abundance.