I'm a paranoid and distrustful person, so I don't and haven't kept any value on any exchange or even coinbase for the last couple years. However, I can certainly understand why people do - to trade. How can it be possible to make any forward progress if you can't set sells and buys at certain levels? the market moves way too fast to see a dump happening, get btc on an exchange (forget fiat, that's like sending a fucking wire transfer that takes ages) and take advantage of it. I'm not excusing Matt and his trading skills, I'm simply questioning any notion of being able to trade without keeping fiat and btc on an exchange. You can't do it. Period. Now, if you are still a lucky bastard who paid a buck or less for each btc and keep them in cold storage, go fuck yourself - you don't have the right to criticise someone not in that boat.