It really depends on the coin and the company behind the coin at the end of the day. It is a smart thing to do most definitely, but really the question is how long is long time holding? Are we talking a few months, a year or maybe even two years? Personally I go by this, if a coin isn't treating me well for more than three months, I see them like the company is treating their coin as a hobby and not like a real thing, which people invest into and expect a major value increase.