Why not? Im 21 and the idea of driving around in an RS4 I find pretty boring to be honest, and thats about the reason why I would spend money on an S3..
Weather a more expensive car is 'better' or not I think is personal opinion, for me an RS4 is not better because it has 4 doors and would look like I was driving my dads car, same story with M3 etc etc..
Ive been lucky enough to have access to lots of fantastic cars since I have started driving so in a way my personal car is a play thing and spending 5k on tuning a £30k S3 is still some way short of being able to afford an RS4..
Weather a more expensive car is 'better' or not I think is personal opinion, for me an RS4 is not better because it has 4 doors and would look like I was driving my dads car, same story with M3 etc etc..
Ive been lucky enough to have access to lots of fantastic cars since I have started driving so in a way my personal car is a play thing and spending 5k on tuning a £30k S3 is still some way short of being able to afford an RS4..