I saw something on a friend of mine iPhone I was amazed, this guy has 3 pieces of bitcoin but he didn't look it when you look at him with mere eyes, I ask him how he has come this far, he told long ego he was seriously investing on all kinds of coins with little amount of bitcoin but then most of those coins help him to realized enough amount to buy more bitcoin because that was his primary target. He normally buys those zero value coins when they appreciates it will be enough money, and that's how he convert and swag all to bitcoin and today, he has 3 piece. Is good to be diversified in your investment, somedays something good will come out of one you don't expect.
Your friend had a perfect strategy that worked well for him.
This goes to show that not everyone listens to the advice of invest only in Bitcoin. I have invested in altcoins in the past and got pretty good profits from it. Swapped them for Bitcoin and did repeated. But then this is not for everyone. If you want to diversify, diversify into a less volatile asset if you can manage the risks involved.