Let's give 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!
Individuals like you when suffered losses would then blame Bitcoin and certify it as a Ponzi scheme. Bitcoin was never a quick rich money scheme. It has shown a significant growth through the years.
You cannot become rich by quoting your example, you can loose everything if the price dives back to 6k level, then you migh have to wait a year or so for it to again come back to 9k level.