Its a common adage to go for quality over quantity however when all of us start quality is a very different value to what it is to us now. I remember watching people using sd caputre for gaming, awful audio but because of the limitations was "quality" work for them. Nowadays its hyper crisp audio, HD footage minimum and it moves off what you can show and falls onto the "Quality" of your person.
If you are a skilled editor and competent commentator you could know 3 vids out a day if you wanted to and get a tonne of views in the process so the argument sort of falls flat here.
However for a start up, go for a lot of videos to find your niche then hammer down and nail presentation as you become more focused on your target audience.