"We should be able to see teachers' salaries (including a breakdown of how much they make per month of the school year)" Yep, we should know exactly how much each teacher makes, because then we might have an appreciation for how little teachers are paid in this area. I have been teaching for over 26 years and have an incredible appreciation for all that teachers put up with, from parents, kids, and fund-raising that they have to encourage.
This is not about the teachers or the students, it is all about the companies that make it seem like they are doing an incredible service by having the fundraisers, and the school districts that try to encourage this in order to get extra funds for the districts.
If you don't want to buy the stuff, then put it towards the kid's activity that they are raising money for.