Saving bitcoins for a long time have a major benefit. Suppose in 2010 the bitcoin price was $1 and now its $1040 so the investment has paid 1000 times and in only 7 years, where can you find a better investment than this??
Never mind about 7 years earlier, just a few months ago it was only about 700$ and it was able to get to nearly 1200$ in a really short time, so saving bitcoin is not only good on the long term but also on the short term if you really pick the best time to buy and sell, but also long time saving bitcoin may really work but we are not sure about the future of the bitcoin.
If we will discuss like that, than bitcoin is great for daily trading but only if you know when will be it's price high and when low. Problem is that bitcoin is so changeable, it's hard to determine in short time when to sell and that's why people prefer long term invest. That jump from 700 to 1200 was simply luckiest moment and that happened very quickly.