There are chances of scams everywhere and therefore, you've to be double sure here before doing any transaction. Online transactions are more prone to different kinds of risks and scams. The online world is full of malware risks, cyber attacks, online frauds and scams. So the party has to be smart for one's own sake so that you do not have to face problem later in the future.
if you invest in the official market exchanger site from bitcoin, there will never be a scam. prices suddenly fall? it's not a scam, bitcoin is indeed volatile and I really enjoy the current price movements.
You have to watch the market on regular basis so that you're well aware about your market environment and also you can safeguard yourself from the various kinds of risks probing out of the same. One who is well prepared and aware in advance will only be able to survive in the long run!!