The problem with most people who invest or trade bitcoin is that they don't have an exit plan, i does not matter if they get in early or get in late, they always get greedy once they see the price rise and don't take their profit while they are still green, so whether its a bubble or not they get caught up in the trend and don't set goals, sure the crypto market is hard to predict and there are always ups and downs but trends can be easy to follow but the key is to stay calm and not to get greedy and have a set goal.