While BTC is good, there are other projects too that are cheap and can potentially earn 100X times than holding a fraction of BTC. Most of the time they say its only BTC that matters but when it comes to making a profit by the time of bullrun, its always those cheap altcoins that will make you rich. Holding some altcoins isn't so bad when they are among the top 50 coins.
Sure, I never disagreed that people could make a lot of money trading alts. But knowing how much altcoins are out there, best of luck actually picking the right ones to short term "invest" in. It's a huge huge gamble if you don't know what you're doing.