Basically, talking about altcoin important or not depend with how much fund we have when trading in cryptocurrency, difficult to earn much profit for trading in Bitcoin with small fund but different thing if low budget and use for investing in altcoin because price up and down drastically. I think as small fund for trading that reason why altcoins is most important part in cryptocurrency. For bigger fund there are not spent their investing with altcoin because know bigger risk when price dropping almost difficult back to higher price, but for low fund its interested when price drop buy back at altcoin and earn more profitable than bitcoin investment.