Who are you trading with at each of these sites?
Bitfinex - other traders.
1broker - the broker.
btc.sx - ??
Which type of trading is better? When trading with other traders, the risk is low volume. When trading with the broker, the risk is that they hike the spread just when you think you're making money. Do these factors really come into play, or are they just theoretical?
With 1broker the spread is 2.8 points. How much is a point? If you buy and sell right away, you lose 2.8 ... dollars per bitcoin converted to bitcoins?
Obviously its 'better' to trade against other traders, since you can see whats going on. I have no idea whats going on in 1broker's account and thus there's less opportunity for me to trade in anticipation of it.
As for 1broker, you're loosing an amount equal to (2.8/[BITCOIN PRICE])*100%.
In other words, if the price of bitcoin is $150, $2.8 spread equates to about 1.9%, roughly double the Bitstamp fee (remember, you're only paying it once per in-and-out not once per in-or-out).
However that isn't really fair, because on Bitstamp you're going to suffer from slippage as well, sometimes of a considerable amount. So, there are ups-and-downs to both systems. The primary problem I'm worried about with 1broker is counterparty risk. BTC.sx is also trading against the broker as well.
Theres one small thing I'm not quite understanding about 1broker though.
Say, theoretically, I were to leverage 100 BTC long BTC at x2. If the price goes up 1%, I make 2%. Now, if the price goes down 0.99% (to bring it back down to the original price) would I lose 1.98%, bringing me lower than when I originally invested due to beta decay, or would I lose only 1.96%, bringing me back to where I originally invested?
Whats really weird about 1broker IMO is the whole way they do everything by percent rather than exposure, which can create some super odd results. Say like for some weird reason I'd held a long at $100 since a long time ago, and now its $150, with leverage 2. Then, I short leverage 5, with an equal amount. Now, the price goes down to $100. Believe it or not I make money from that. With two equal leverage 5 trades. The system is just a bit trolls, IMO.