Recently some expert, I forgot the name, said that every crypto investor should own atleast one bitcoin and then you can buy another altcoins. Because number of Bitcoins is limited, 21mil 
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. Charlie Lee said it, @Satoshilite.
The reason why some people are taken Bitcoin for granted is because of the new gold rush in ICOs, but ut has been shown that 90% of these ICOs are dead, so why not have a stake in a sure thing. I believe there would be a time that holding one full BTC would make you a millionaire