A lot of people thought Bitcoin was expiring in 2014 as the price crashed from $1200 to $200, but imagine if they just held on.
I think it depends on a lot on your time horizon. If you are one of the few who can profit well by trading short-term, then all the power to you! But I've seen a lot of people get wrecked doing that.
That's because they probably came at it like a get rich quick scheme and did stupid things to lose their money. If you treat it like a business, you can make money. Again, if you buy and hold something, how are you actually using it? It's just sitting there going up and down with price. I catch profits in those swings to make my income. As I said in the post, trading and long term investing are NOT the same thing.