Flying for score is as legitimate a reason to play this game as any. It can be very competitive to optimize your flying to push the formulas that calculate score to the limit. Cheers to those committed to high scoring!
Equating score to skill at ACM is what causes much of the friction. Latrobe's book is pure brilliance in covering many of the facets of this phenomena.
Its just too much fun to shoot down an LA7 in a P-40 and the like for me to ever fly for score. Especially against those that tout their scores as proof of their ACM abilities. I fly for pure fun and silliness.