It's probably the only way to become a millionaire in the (relatively) short term. If you have a better option to put 100k at right now I would like to hear it, because no matter how much I luck around, all I see is stupid startups, ICO scams, falling stocks, random alts... what can give you realistically the 900% gains needed to become a millionaire from a 100k investment other than bitcoin?

Sure we will see a random alt deliver higher gains but it's a lottery, no alt has fundamentals as good as bitcoin.