I think you are glorifying it big times. My father has been a full-time writer for the past 15 years and their is nothing wonderful about this lifestyle at all. Money is tight (and comes in irregularly) and the deadlines often force him to crank out words all through the night, whether he feels "inspired" or not.
If I were you I would really think twice if this is really your goal. Once your entire existence depends on your writing it becomes a lot less fun (I guess that's true for pretty much every passion-turned-profession.)
I honestly don't know a pro writer who thinks that way. All I know thinks it's far more fun, once you;re able to go full-time. And I mean all of them. It's certainly one heck of a lot more fun for me.
I don't want to pick on your father, but if he's having that much trouble making ends meet, he either isn't really in a position to be a full-time writer, or he needs to move to a cheaper area. If you;re going to seriously struggle to make ends meet, you may as well make it easy on yourself and keep a day job. Most of use don't struggle that much.
As for deadlines making him crank out words all through the night, whether he feels "inspired" or not, we all do that at times, but for most of us, it's because we want to. If you have to live like this, get a job. Though any writer who needs to be "inspired" to write isn't likely to get anywhere, anyway.
You can't judge every full-time writer's lifestyle by that of you father. There are a surprising number of incredibly rich writers out there, and I don't mean just million dollar rich. I mean mega millions rich, year after year after year. There are also a massive number who earn enough money to live far better than the average family, and without working themselves to death.
I think you need to read more books, blogs, and websites pro writers put up. I've looked at hundreds, maybe more, and I've yet to find a writer who thinks being a full-time writer is less fun. They love it, they revel in it, they can't believe they're able to actually live such a wonderful lifestyle.
But like any otehr way of earning a living, you have to make enough money to take the pressure off, or you shouldn't do it. Writers grossly underestimate how much money it take to live without pressure. Someone mentioned $35,000. That's just average income where I live, but if I wanted to live that same
exact lifestyle, I would have to earn
double that.
Fifteen percent of my money goes to an agent. Another fifteen percent and change goes to pay to SS. Then I have to pay state and federal taxes. Then I have to buy my own health insurance. Half of my money would be gone before I could spend a penny. Then I need enough money in the bank to cover any vacation time, and time off because of sickness, and to get through a period where checks came in irregularly.
Being a full-time writer is wonderful. I can think of better ways to live, of a couple of things I think I'd rather do, but they're illegal, immoral, or hand to mouth living. But to make it wonderful, you have to be making enough money to live without worrying about paying bills, and without working yourself to death, except when you want to, just like any other profession. This is always at least double, and usually at least triple, what most think it takes, minimum. More, when you realize you also need at least six months income in the bank at all times.
The real question, I guess, is how much your dad loves living the way he is? Does he hate it, or does he think it's a wonderful way to live?
Anyway, being a full-time writer is, for all I know who do it, as wonderful and as fun as it gets, as long as you're making enough money to
live, rather than to just survive. Really, how could spending your life working for someone else be better? How could working a job you hate, the way most do, begin to measure up?