However disclosing these practices is not enough. The end consumer has no negotiating leverage particularly if they have no insurance. The government or some big organization needs to negotiate the best price for them.
1. For people without insurance it would possibly give them a little more bargaining power in the negotiations around bills. Right now the hospital holds all the cards, especially when it comes to "costs".
2. It would shine a little light into an area that is generically murky. A lot of people are champions of capitalism/markets being the solution for all/most problems, but market systems do not work well at all when there is a heavy information imbalance. Pretty much every theory of capitalism talks about that. Right now an enormous information imbalance pretty much sums up the U.S. healthcare system.
If you go down the street, however:
https://www.vox.com/2019/1/22/18183534/zuckerberg-san-franci...