Because it takes constant time to do in-depth market research, holding on to a coin has historically been the best course of action. The secret to earning greater money in the area is patience.
Holding for a long term is good and better as, it comes with a minimal amount of risk and by that I mean, the risk which you can access easily and have a promiscuous future about but, you've got to be mindful of the coin your holding.
At the time, the altcoins I've tried holding haven't been of any benefit to me and it always feels as though, they was a big mistake. Most of the altcoins out there are pump and dump so, you don't hold for long, once you get some pump, take profit and leave.
Bitcoin is your most trusted coin for a long term holding. Get it, hold and have patience about it to make you some profit and even then, still hold.