It would be stupid of pharma companies not to market their new products. They have bills to pay and investors to pay. You cannot fault them for it.
As a shrink (who does not have a primarily pharmacology practice, but uses meds whenever needed), I never use the newest medicines. I let other docs find out whether they have any advantages first, or any repellent side effects.
For Bipolar, I still think good old Lithium, a salt dug out of the ground which costs pennies, is the best, safest medicine. It works.
From the NYT: New Drugs Have Allure, Not Track Record