Yay! Someone else is preaching the sound gospel! As a film sound engineer, I often have to convince newer filmmakers that all their set dressing is worthless if it sounds bad (but that a good sound design can make any set feel alive). Another fun demonstration is to subtract frames from the video, more from each second at intervals of about ten seconds, and see when they notice. It's usually around four or five taken out - and these are filmmakers, people who should notice more than anyone else. But if I put just one sample of either zero or full scale audio into a dialogue track, they notice. It's impressive that our ears can detect 1/96,000th (or, at most, 1/44,100th) of a second of bad audio, and it never ceases to amaze me that our eyes do not detect even 3/24ths of a second being replaced with black or gray or white.
Ask five economists and you'll get five different explanations (six if one went to Harvard). -- Edgar R. Fiedler