Just Pharmaceuticals not even all medicine is literally over half of all advertising spend in the US. And that is just the tip of the iceberg and doesn't go into the incestuous and conflicting interest relationships between pharma, pharmacies, medical providers and insurance companies all inter-invested in each-other to simply grow the pie larger since ACA limited profit percentages.
It's the single most powerful lobbying group as a whole, and nearly every politician is bought and paid for by them. Good luck getting a majority or super majority to work against them.
Pharmaceuticals are only a (high) single-digit percentage of medical spending in the USA, and the (likely) reason for the ads is the highly competitive nature of the market. Most of healthcare spending is on labor, specifically doctors and nurses, who are protected by highly effective trade and lobby organizations.
My point stands... as a whole, they (medical industry as a whole, including pharma) are the single largest lobbying group and nothing you've said refutes that. My use of pharma ad spend was an example of how much money they put out as an indication of how much lobbying power all of medicine as a whole has.
It's the single most powerful lobbying group as a whole, and nearly every politician is bought and paid for by them. Good luck getting a majority or super majority to work against them.