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!
You have a valid point here, but not anyone has access to 100 bitcoins if you but that amount at $9k which means an investment of $900,000... So, there are tons of investments who will pay that 1% profit with lower risk. Your example doesn't work if our investment is small or something like $100.