The article does make a very interesting point. One which I'm hoping jerguismi could respond to.
The article talks about the slow transaction time being a barrier to arbitrage. Basically, you couldn't buy in one market and sell in another market simultaneously. Wouldn't that make an arbitrage opportunity speculative?
Also, because jerguismi is a founder of a bitcoin exchange, isn't it in his interest to promote trading bitcoin? I have no reason to believe that jerguismi would misrepresent his knowledge, but I think his role in the bitcoin community isn't de facto evidence that his statement is true.
> The article talks about the slow transaction time being a barrier to arbitrage.
The article is wrong on many levels. You don't need to transact (or even own) bitcoins in order to arbitrage. You can just buy/sell and open short/long positions via the exchanges websockets API... Not WallSt speed, but a decent speed for any self-made bot vs point&click traders.
In the Spring 2013 I made $4k in one month on that. Just bought $2k worth of bitcoins and sold them for $6k a month later. But it was way easier back then (because bitcoin price just kept growing without any downward motion), and I was risky.