I do agree there would be a benefit from removing the marketing. But the benefit would be little more than what is spent on said marketing.
It comes back to the same thing--where is the money going to come from? Few medicines actually have a high per-unit production cost. The cost is usually mostly amortizing R&D and the production equipment. (And looking at R&D overall--you have to count the spending on the failures as well as on the successes.) Sell fewer pills and you don't cut that R&D cost, you just distribute it across fewer pills.
It comes back to the same thing--where is the money going to come from? Few medicines actually have a high per-unit production cost. The cost is usually mostly amortizing R&D and the production equipment. (And looking at R&D overall--you have to count the spending on the failures as well as on the successes.) Sell fewer pills and you don't cut that R&D cost, you just distribute it across fewer pills.