Despite their polished, pristine images curated by high-end PR firms, nearly all industries hold secrets they don't want their customers to know. Not every musician in the orchestra is hitting every single note. Ask a local journalist about all your community's hot goss. You may not hear the representative when you're on hold, but they can sure hear you. There are a whole lot of secrets lurking behind the scenes — just ask the employees who know it all. 

From the fact that medical bills are largely negotiable to how consultants don't know what's going on either, here are 34 industry hacks customers are not supposed to know, as told by workers themselves.