You have said how much you are doing but not answered 'How do you do it, or why'. I would like to read the answer to that. 
on my post about how much is too much.

So I'm answering.

I started writing at 4.  Which gives me 22 years of storywriting to contend with, though admittedly, it was fanfiction (cartoons *grin*).  I never did work out 'how I did it' - most of my stories and poems are half remembered fragments at the very edge of dreaming.
How I do it also has a lot to do with the support structure I have - my freinds, my partner, my children - all of whom contribute, in thier own ways to 'how' I manage.  I'm lucky enough to be best freinds with an incredible person who isn't a writer but expects me to write anyway - and has frequently offered his desktop or laptop so I can work and still stay at his house. 
I'm also lucky enough to have adopted siblings that are also very supportive of all my 'endeavors' and push me to do my best in them too.  One to the point of giving me more work next year (GRIN) and one who babysits frequently, and helps out around the house - though we do feed him a lot :D.
I'm the local Nanowrimo municipal Liason, which is cool and has let me meet lots of nice people - lots of writers who I support and hep to inspire as far as I can.  And my children inspire me to do the best I can because they deserve a good future, which I can provide if I am the best I can be in my work.  I suppose that's a why....
The practicalitiies of the how I do it is basically that I write.  I rarely ever procrastinate any more - most of my 'personal' essays become articles for my sites at some point (this one won't) so I'm always working on new stuff.  I also only sleep a couple of hours a night - and think about writing constantly - I always carry a pen and paper around with me because I never know when I'm going to come up with something new and something that I want to write.  That and I packrat everything.  I have scraps of essays everywhere - on notepads, in places in the computer that I shouldn't HAVE stories...  it's fun in the main.
And I type really fast. :D

The whys get to be complicated.  For the kids - for my partner so that he's got reason to be proud of me - for myself so I can prove that there's a reason I am the way I am - bipolar disorder being the mainly cited reason from some for why I act like this. 
I also write becuase I want others to know it's ok to be certain ways - and that there's no shame in being so creative it takes over most of your life - that there's no reason people can't write as much as tyey can, once they get used to the work load.  That there's REALLY no reason that people can't just be themselves.
And becauase some of the the things I do with my writing are 'hard' for some to get the hang of, so I like to explain - free verse, and website copy are two of them = finding markets and googling are others.  It's good to give back to the communities I'm from.
I don't do it for attention, nor fame.  That's probably the reason I don't do much to actually draw attention to the person behind the sites other than make jokes about the 24 sites, and the work we all put in.
I have staff too, so I'm not all on my own, but generally, it is true that 80% of what goes up on most of the sites is me.  Authortor is ALL me at present - the PDF that is issued once a month is just ME.  It's scary.  It's also lots of fun...and at the end of the day, that's one of the more honest whys as to WHY I do so much.  I enjoy it.