When it come to crewing and getting a film together the most expensive element of the film is usually the crew cost for labour followed by rates for different departments. Lots of people however with the price of mid tier cameras dropping all the time automatically think sound is doing the exactly the same thing. This is because they have worked with lower cameras and also where the sound was done on a zoom.
Time > Money > Quality > Time > Money….. Depending which outcome you want you need the other too. If you want to make a lot of money on a project then you need time and quality to be able to market it. If you want quality you need time and money. If one is missing then you have to compensate more with another.