I completely agree..
But if I recall years ago & when DB was alive,this particular issue was hashed out many times.The consensus was back then that this show puts the vendors first,the spectators second.
The Majority of the vendors were/are retired and could come during the week.
Organizers subtly suggested without vendors,there is no show.So the vendors got to set up early and trade amongst themselves when they wanted to.
Anything that came afterwards was gravy.

Collecting Vintage Sunoco