I would say you are that brave enough because at first, you have already know the risks it would take on investing all of your money into pure Altcoins only. Although that was experimental I think on your part, still you risk money that supposedly have the potential to grow when you part it on investing and holding into Bitcoin as well. We all know that any kind of cryptocurrency have their own potentials that are being unlocked in no time since we are in a virtual market wherein currencies move in volatility so we can never tell when and how it will happen. But if your point of view that making investment purely with Altcoins suit preference and style as well as strategy on doing investment, it will be always your choice since it was your money. But if I were you, I will still go into Bitcoin by having Altcoins as well since both are beneficial and always have a potential to grow making benefits.