Yet another poorly written
Yet another poorly written clickbait titled article. This article is littered with poor grammar. The text never delivered the 'trick' promised in the heading. Additionally you did not mention the dealers number one money stream, the F&I office.
If anyone wishes to gather bargaining knowledge, i found a youtube channel run by a father/son team which educates consumers looking to buy vehicles.
their videos and more can be found at YAA.com
that stands for YourAutoAdvocate.