It looks like this is quite promising when we save a bitcoin for long periods of time, a year ago the price is only around $300 and has now reached $1200, if we buy and sell a year then the price will menapai $2500 or more.
This is how bitcoin really good for saving in long term or run, many people experienced that, because they bought coins in early time and hold it for long and now they are gaining profits, maybe its risky because there were time of coin value crashed down yet they continue on believing that it will rises up again so they got what they really want a big profit.
There is always some risk, but I think we can trust Bitcoin. The currency is available since some years ago and investors never regrets about buying Bitcoins and adopting Crypto-Currency as investment scheme. Even if the price crashes for some time it will recover later and we will make our profit. On long term Bitcoin worth very much and there are people planning to store it for the next decades!