I dont think you should spend $$$ for quality video. The main questions will be: Is your website audience quality or not? If the website audience is quality - your product will sell without video.

But if your website gets junk traffic, then the quality video will not work.

A quality video will be good only if you do A/B testing and test what triggers a user to convert? Does a video triggers him/her? or Headline? or Call to Action?

Dont spend $$$ on quality videos if you have not found our what is your highest converting module. (Video, price, description, pdf, ebook, whitepaper.....)