It's not 1% slippage on a 10m trade though, that was on a 1000 FIL trade. Crypto support is quite fickle. I didn't even go near the withdrawal aspect, but with

It's not 1% slippage on a 10m trade though, that was on a 1000 FIL trade. Crypto support is quite fickle. I didn't even go near the withdrawal aspect, but withdrawing anything more than ~5 BTC worth of currency from an exchange will take at least several business days to get verified, and depending on the exchange you use might takes weeks or possibly you'll never see your money again (there are several stories of less reputable exchanges freezing accounts for "fraud" when they attempt a large withdrawal). In principal I do agree with what you're saying, but crypto is still very much the wild west at the moment, so I personally would not be trying to shift millions of dollars around on such short time frames.