well this is a very bold statement, because many people have made a lot of money using bitcoin. of course bitcoin is very controversial at the moment because it is still fairly new and peoples emotions are the main reason why it continuously fluctuates because people get hyped by the dream of making lots of money - and start buying when they dont really understand the nature of bitcoin and then panic and start selling as soon as the road gets bumpy - this leads to these high and lows in bitcoins performance.