Some pros or studios are a bit shadier when pricing comps. They give a student a flat rate x dollars and this is it. Now if the student has access to wholesale and starts questioning the final dollar figure it can cause drama. Is it going to get a cheap end dollar figure no probably not. Walmart or saks doesn't release wholesale and what they pay to shoppers why should organizers or dance studios release it to their clients?
OMG. Pro's are contractors. I'm in the service industry and pass through costs with receipts. I negotiate my fees, labor costs, and schedule. Why do dance pro's not want to operate in the same manner?
I pay a pro for labor and time. I pay a comp for entries. I pay a costume manufacture for clothing, I pay the video people for a video. I pay the photographer for pictures. I pay the hotel restaurant for breakfast? I know what each costs and can make the best decision possible for the outcome I want.
I don't begrudge pros for making money on their labor and time commensurate with their education and training, but arguing that fees should be hidden to avoid drama doesn't make sense. Some people will write checks and not bother checking because it does take time to research things. Others like some on this forum take great care in managing their finances.