24fps is the standard because it is as cheap - as slow - as you can go with expensive film emulsion and maintain the illusion of lip sync. Back the early 1900's silent days it was 16fps because there was no lip sync. Today, shooting RAW, producers like 24fps because its as cheap as you can go for storage, rendering, color correction, etc. - remember, not too long ago, storage and arrays used to be very, very expensive. Is 24fps a "real" film look? Who knows, the producers use it because it is cheap.