There is always a risk in every investment you make however you will used your intelligent and strategy to avoid any risk including scam and lose of all your profit,you should study investment very well to know how to do the perfect timing in buying and selling.
Theres no business in the whole world that does not involve risk. Only risk takers have greater chances of succeeding in life but that does not mean take risk without proper reason/logic. Do proper investigation before taking any risk and same is the case with bitcoins.