Sometimes it means "We don't want to spend a lot of money training this guy who we won't be able to retain if he gets a better offer."
At really entry-level jobs like fast food, where training is quick and turnover is always high, it sometimes also means "This guy might be able to read the workers' rights poster on the door and explain the workers' comp program to the idiot who spilled boiling grease on his foot.
I used to live in Ohio, and had three presidential candidates visit close enough to conveniently get to. I went to the Edwards, Obama (primary season), and Romney events. I didn't order advance tickets for any of them. Both Democrats had volunteers outside the security trying to get everyone who showed up with or without tickets through security and into the main venue. At Romney's I didn't get in and just loitered around the outside fencing. That might have been the better experience -- I could still hear the speeches, and the outside crowd had better signs and more colorful commentary than the inside ones.