[dalore]

Perhaps he realises that other people are doing it too and, as you said, realised the more people who do arbitrage the more it goes away. He could be out to stabilise the bitcoin exchanges as well as provide liquidity to the market.

Perhaps as more people use it, the demand for bitcoins go up also, and since limited supply the price goes up. And he might have substantial holdings of bitcoin he wants to sell. More people trying to find arbitrage opportunities makes it easier to sell his bitcoin which are now higher value.

[_coldfire]

A big red flag in the SEC decision was that large arbitrage opportunities exist in bitcoin markets for far longer than is considered normal.

Anyone wanting more mainstream adoption of bitcoin would do well to promote arbitrage trading to as many as possible.