Looking at bitcoin, the choice to invest at this time is up to the trader as what he is looking for. In my opinion, I do not see bitcoin reaching 50,000, or 100,000 anytime soon like Mr. MacAfee suggests. Instead, I predict it will hover for a while in the teens. With this being said, the goal is always to buy low, sell high. You can absolutely make some good profits buying at 13,000 and selling at 18,000, but don't expected 500% returns anytime soon. 
Do you really think that the price will rise to $ 50,000 or even $ 100,000? Actually, I think this is fantastic prices and almost impossible. One person Even argued that The 2020 Bitcoin will rise to one million dololors, but I think that this is Pure water manipulation of the public consciousness.