Right now, I simply don't have the time to commit to it. I need the freedom of the to-go tin. Which has its own inherent advantages.
Let's not forget one of the prime positives of the to-go tin: it eliminates the need to clean your dishes. Or, even buy dishes in the first place. If you don't buy dishes, there's a couple hundo right there to spend on to-go food. And, the waste you create by ordering heavily packaged to-go foods, you might make up on with water saved by not washing dishes. I mean… maybe.
As far as health is considered, your takeout can be as healthy as you want it be, just like your cooking. Often I'll opt for pick-up instead of to-go, and by walking to pick up my meal, I get some extra walking time in my day -- which is never a bad thing. Why pay for a gym class when you can pay for mozzarella sticks a few miles away? While money is said to be the ultimate motivator, it pales in comparison to red sauce.