Wouldn't work. I've been arbitraging "safely" between multiple exchanges for a long time without moving anything and opportunities for actual profit are pretty rare. Certainly not every day.
Say I hold BTC in BTC-e and Stamp to keep things simple. Without moving any funds I can certainly buy up a bunch of BTC and sell the same amount at the same time on Stamp, profit! But now I'm done trading until the difference in exchange rate between these 2 exchanges shows some significant change. Right now the market is so flat there is literally nothing going on and there is no real safe arbitrage opportunity (not even one which does include moving funds as the spread isn't nearly big enough to pay trading commission on both ends + money transfer fees)
There is only a 1% spread between Stamp and BTC-e right now, which is still more than it is between Huobi and Stamp. Where are their profits coming from during times where the market is flat as a pancake? It doesn't make sense. Right now the daily profits should be right around zero until volatility returns and exchanges speer off in different directions several times a day. If they are still paying good daily rates right now they have to be a ponzi.
Or it's possible that they are doing altcoin trades and not arbitrage?
Also, you can keep up with their pool profit here:
https://twitter.com/BTC_Trader
That is updated daily to tell how much % each person earned.