A few reasons:
1) My computer was quite literally falling apart - bits were coming off and the thing was cronicly overheating despite my best attempts at fixing it.
2) DJTT turned into a grind when i was no longer able to create the art i wanted to - definitely burnt out there big time.
3) The GFC totally skrewed up my line of work - I've had to change industries (from new housing to virtually recession proof insurance work).
4) All of the above left me in a pretty bad mental state that was really no fun at all.
5) There was no way i would ever be able to afford a house going the way i was going - personally i see getting myself into a house of my own being one of the most important things i need to achieve to set myself up properly financially.
6) I moved a fair number of times in a short period - intact i still have 1 last move to make when i get a house of my own.
All thats been taken care of though pretty much -
Working in a different in industry that pays well and is very stable.
Got a deposit for a mortgage together (just waiting for the housing market here to finish crashing so i can swoop in on the bottom of the market).
Got a new reliable computer rig to create my art with.
Mentally I am in a much better state now my life has returned to something resembling normality.
Even got myself a nice GF I'm very happy with along the way - so things are looking up a lot more :)