Drug companies also push a significant amount of research into very serious conditions that rob people of their lives. Government does very little research into arthritis (and it's many variants including Rheumatoid) compared to the private sector. The major drug companies are spending billions every year trying to discover the cause and treatment for these conditions because they are extremely lucrative due to the damage they reap on a persons life. People will literally sell their own mothers to gain access to drugs that will reverse the course of these conditions. The proof of this is the shear number of snake oil (herbal) treatments for the same.
In addition the primary driver of Cancer research (the #2 killer) and Heart/BP/Circulatory (Heart disease is the #1) research is in the private sector. Entire companies like Myriad Genetics spend their entire research budget on Cancer research from identifying the cause and genes responsible to developing treatments including one-off genetic treatments that cost $50K a pop and they will never make money on.
You make serious light of depression in your post, something I have a serious problem with as it is a very serious disease that results in death far too often and something one of my loved ones suffers from. You might not think depression or ED is a serious problem but that doesn't give you the right to belittle the problem and decide that no money should be spent on it until whatever pet cause you have is cured.