Don't diversify. There's nothing in the world that can get close to the potential returns of Bitcoin. And no this isn't gambling, it's called calculated risk taking. People with balls do it 
Right, penny stocks do not exist.
Penny stocks and bitcoin can both have ridiculous returns, yes. But they are COMPLETELY different investments in almost every way besides that. If you are taking a calculated risk in a penny stock with a (relative-to-you) large investment, you would pretty much have to be a professional trader. There is no other way that you would accurately be able to calculate the risk.
Bitcoin does not require these years of experience or training. You don't have to pick the RIGHT bitcoin. There are alts, but I think we can agree that at least for now bitcoin is far and away the front runner.
Penny stocks /= bitcoin