Cryptocurrency... Is it Worth it to Invest or a Mistake?

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There is a lot of controversy on Bitcoin, Ethereum, Litecoin and other similar cryptocurrencies. Many experienced investors have come out and said that cryptocurrency is just a facade and there are other dangers involved that are not visible. On the other hand, we've seen several people make a ton of money on these investments and others lose the same.

I'm curious to see what some of you think on cryptocurrencies; whether they're good investments or just a waste of time. But more importantly, I want to know why. Thoughts?