1: How long have you been in the hobby?
Since...well, let's see, a friend of mine gave me the marines for Assault on Black Reach in late '07. I played DoW beforehand but in all honesty I had no idea the two were connected
2: How important is Fluff to you, relative to other aspects of the hobby?
Considering I love the whole hobby so much, it's very even with most other aspects (modelling, painting, gaming, etc). I do love to write though, perhaps due to the fact I'm getting a degree in it, so I tend to show the community of HO my writing aspect.
3: How devoted are you to the works of the Black Library? By this I basically mean what compels you to buy/read one of their novels, do you pick them because of the races involved, follow certain serials, on a whim, etc...
I love everything by ADB, Dan Abnett, the old Gav Thorpe stuff, and the miscellaneous IG novels by people who's names I can't remember.
4: How many codexes have you taken the time to read thoroughly, including older editions?
Oh jeez...well I have every 5th edition codex, most 4th editions (the ones that haven't been updated to 5th), every FW Army List and some 3rd edition codexes. All of which I read thoroughly
5: Do you enjoy postiulating theories, pondering mysteries, and writing your own works to expand your enjoyment of the hobby?
Of course! I've been having a lot of fun running some 40k roleplays and I even entered in the 2010 Fiction Competition (Check out my entry if you have time, by the way!
6: If youa have anything further to add, feel free.
I think my next step in the 40k fluff universe is to start an advice column from the viewpoint of an Ork