Back in the days perhaps. But now, there's not much to be taken out if you're mostly day trading btc and eth. Before 2018 it was good but after the 2018 drop, these two coins are more suitable for long term holding. I'd like to experiement with upcoming coins that could possibly hit gold this year. Btt? Probably. Even the jp morgan coin has a good chance of moving up.
Well, it also depends on the trading strategy you use and the level of risk one is able to make, you see that little move you see on a daily basis fetches some people so much and running to thousands of dollars, for spot trading, your points are completely valid, quite difficult now to really make much from BTC because of its level of stability now.
But, when it comes to margin trading which is quite too risky, there is so much more that one can get from day trading better than some of these coins that will end up getting dumped irrespective of the celebrities involved, their connection and popularity might keep the coin for a while but with time, people will still get tired of it and dump it.