Because altcoin world is too large comparing to single currency on top BITCOIN, how can you speculate a thousand currencies when bitcoin is just there always to show what is the movement in front of us.
and besides why need to expect in altcoins when there is bitcoin that safer and worth trusting .
Altcoins are hard to speculate but it doesn’t mean they are not good, there’s a lot of altcoins project that deserve to be on top as well, so don’t live with Bitcoin alone, better to diversify.
Speculating is not easy and its actually stressing since you are predicting a future that may not happen. You can’t fully rely on speculations, better to analyze the price trend and follow the chart by this you can actually tell when you will buy and sell.