It's worth mentioning that Silver is just one place ahead with not that huge of a margin. Soon enough, it might surpass silver as one of the most valuable assets to own.
Even with bitcoin's quite expensive price, I still think that it is worth it when you buy it compared to other big companies like Apple or Google it seems pointless to try and buy some stocks. Bitcoin will still be able to give you profit even if you invest a small amount only. Of course, it is still most ideal if you can invest more for more profit.