All that's required for living paycheck to paycheck in the Bay Area is a willingness to pay exorbitant rent. The other stuff is a distraction from the real cash drain.
They're both cash drains. One's just bigger then the other, cutting back on both is sound advice if you are looking to save. I agree that you are probably right in that rent is a bigger factor but they are also right in that by not eating an expensive lunch everyday will add up over time.
I think everyone can agree that learning how to properly budget finances should be something we all should learn.
I guess I was thinking about it in the context of saving up six months of living expenses. If rent is 4k+ you have to skip a lot lunches to save enough to cover that for six months with no income..