Why would I want to keep BTC in my investment portfolio? That's most hyped and quite overvalued coin I'd say.
There are other more technologically advanced coins. Is it because of "digital gold" and store of value properties?
Because I still believe that Bitcoin's price will still increase and I still hoping that I could get a good profit from it. Many are still holding their Bitcoin because they are also waiting for the right time to invest or sell their coins in which they could get a good profit.