Quote from Ghost of Cutten:
You should definitely not take the happy pill, even for free. The reason is that if you are happy all the time no matter what, you will lose all motivation to do anything. You will just sit and vegetate with a shit-eating grin on your face, but you won't achieve anything meaningful, won't change the world, won't make anyone's life better, won't experience half the emotions that all humans experience, you won't know what it's like to be truly alive, and you won't fulfil your function as a human being.
Happiness is not the main goal in life, it is arguably not even a goal at all.
P.S. the trader answer is take the red pill, license it worldwide, do an IPO, and become the richest person of all time. You make a lot more than $500m if you can make people happy with a pill, that's for sure lol