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I've been monitoring the market for a couple of months now. Most of the coin value rely on the price of Bitcoin. If the BTC price goes up, every altcoins will follow and if it will goes down, the price of every altcoins will goes down as well.
Since Bitcoin has the advantage of dominance in the market, traders most often use bitcoin as a indicator whether the market is going fine or not. So if Bitcoin is going up most likely other alt coins will follow but not all. Like wise when BTC goes down.But the question is, Bitcoin price/value is still going up but the price/value of every altcoins especially Ethereum goes down. How did this happen? Any logical or scientific basis to explain this. As of now, I am still confuse. 
So the answer would be. More Investors and Traders would easily buy Bitcoin instead of other altcoin because of high volatility of alt coins.