With any financial instruments there are those for who it is a worse deal than alternative. With Bitcoin you have great volatility, but it has been mostly upwards. If you have made loss you are probably minority of the user/investor base.

For example, the current ATH was nearly $20k, and the current price is $9k. If you were unlucky enough to buy at ATH, you are down to 40%. Thats still not that bad situation - for example with stocks it is easy to find bets where you lose 90%.