Let's give an example of you bought 100 BTC at 9000$ Price and the price went 9010$ in seconds then you sold, so your profit will be 1000$, may 500$ fees, but the another 500$ you made it profit in seconds!
Let's discuss at the point!
This is the simple reason whales get richer at each little opportunity. Just imagine the little profit but great when multiplied by the huge investment of $900,000. How many people can afford such capital to invest in? Not many, anyway.
I got into Bitcoin just before the bubble of 2013. One week later it exploded and carried on exploding for weeks.
'Holy shit. This is incredible. It's like a money fountain. I am set, baby.'
After eight orgasmic weeks 2014 arrived and kicked my balls through the top of my head. I was in the red for the best part of three long and agonising years. It got there in the end. It sure as shit made me work for it.
What happened in 2013 also happened in 2017. It's an interval of 4 years. The same is expected to happen in 2021. It's the after effect of Bitcoin halving. From record, Bitcoin soars out of reach a year after every halving.