Makes sense if you consider happiness to be the direct opposite of sadness. It's not good to be sad all the time, so it can't be good to be happy all the time. Probably burns out your dopamine receptors or something.
Bingo. It also makes you make A LOT of risky choices and eschew immediate short term choices in favour longer term risk. This means that on an evolutionary scale, once in a while you will win big but most of the time you will mostly lose some or all of everything you have because the same rules of risk that apply in a casino apply in real life, the house always wins.
To put it another way, this is one of the reasons males organize them in hierarchies. If everyone in the tribe had their positive thinking circuits turned on all the time, the tribe would die because they would be chasing all kinds of risky ideas all the time. Instead, you usually have one or two in a tribe and the tribe uses them to go out into the unkown to take risks and find resources. Most of these guys lose big time, but when they win, they win in incredible ways and the tribe almost always gains as a result.
Lot's of ways to consider this concept.
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