of course we must believe bitcoin, but you can risking your life just for invest your money at bitcoin.
Invest in multiple products to earn good in future, as we don't know which product will perform better in future, if one fails the other will take care of our investments.
I agree with you guys, if you invest in multiple investments or products the higher chance of earning bigger but you need to consider that
if you can really manage multiple investments but if not you are just wasting your money and time.
But if you can then you are going to be have more positive outcome.
You need to research well before investing in any product, as I don't have faith in online investments at this stage but investing in gold and bitcoin can help us in long run.
Agreed there are many ponzi sites in existence who promises you to double your coins in short term and at the end of the day you come to know that you have been cheated, so beware of them.