As someone who has been attending Broadway shows since about 2006, I have found myself saying it has become wildly unaffordable. I also believe Hamilton was the starter show/year of these insane prices. Producers saw what Hamilton was getting away with, people willingly spending $1,000 face value for orchestra tickets, and things have been out of hand since.
To answer the OP’s question, in my personal opinion, balcony seats should be NO more than $80 (I’m looking at you, Merrily), ranging from $20-$80. The Mezzanine should range from $40-$150 pending on the theatre), and orchestra should range from $75-$225. With that said, premium should be capped at $225, and should only include center orchestra rows G, H, and I. Some theatres / shows are selling nearly the entire orchestra as premium which is absurd.
Additionally, lotteries and rush seats that are partial view (and some shows are selling seats that should be ILLEGAL to sell for any more than $10 based on how awful the view is) should be capped at $35.
how this gets accomplished these days? No idea. But those would be my ideal ticket prices to get me to shut up about how expensive broadway has become.