[Retric]

"Exactly! Good record labels book venues, organize travel, handle the legal stuff like insurance etc, they are well connected advertising and know people at the radio stations advertising and know the bloggers,advertising they can introduce them to other bands/producers/video editors,advertising ... in short: they make sure that the band can concentrate on their music and that the target audience knows about them advertising"

Edit: If your promoters don't consider such things advertising find someone better that understands the industry.

PS: 'book venues' is easy, it's filling them that's hard and that take advertising. Don't forget bands also have an agent often handles a lot of this stuff a well.