Maybe because gold is tangible and bitcoin is not. I remember telling other people about how good investing in bitcoin is and they were doubtful about it because they say it has no assurance that their money would grow.
I have been scammed a couple of times these past months from people claiming to be cryptocurrency traders who would convince you to invest your money in trading then promise that he can give it back double. The next thing you know he already run away with it claiming to have lost all the money in trading.