Because I'd seen the amount of problems my sister had with getting a sub-£1k car as her first car. It cost more to get it past it's MOT than it was worth; whereas doing it the way I have I've got a warranty, 3 years free servicing, free AA breakdown cover and a car where everything actually works haha.
I used to drive my sisters car and thought it was a good little runner, I've only had my new car a week; but when I got into my sisters car yesterday to move it off the drive, it was absolutely horrible in comparison. The clutch was really heavy, it whined, the gearbox was clunky; ugh.
All-in-all, at the end of the 2 years this car will have cost me £6k, but I'm getting a heck of a lot more car for my money; so I'm happy