Well. to answer your questions...
1) How do you know how many trades are coming and going? There is no Time and Sells. You see a couple of things when you look at the screen...You see the depth of the book/market...very similiar to a level 2 screen....and you see the prices change...you do not see time and sells. So you can't say "only a handful of trades where done" FWIW, Matchbook is doing about 500 million a day, most of it in Dollar/Yen Euro/Dollar and some in Euro/Yen...so if a half a yard a day is going by on a couple of trades, well...
2) The 5 pip spread that is quoted is the worst case scenario. The fact of the matter is, even in the interbank trading "system" (i put system in quotes because its not really a system, but a bunch of guys calling each other on the phone) the best you will get is 2 pip. Some internet fx brokers may show 3 pips, but try and hit them, and all of a sudden they fall off the bids. Matchbook's Specialist is showing the worst case scenario and will in fact honor on the hit...it goes right to the ECN and is matched.
3) If you will step in as a "market maker"...i.e. just put a limit order on the book, if that order is hit, Matchbook does not charge you a commish...Only the aggressor of the trade is charged a commish.
4) As to why trade the cash market instead of the futures? Really, the question is why trade the futures? The futures were set up because not everyonne has access to the interbank system (plus hedging etc). The fact of the matter is, by design, Futures markets are set up for things that where highly illiquid - such as tons of beans or the value of a stock index - in order to off-set the price risk of the producer and end user. The speculator takes on this price risk and hope to profit by price change. This does not make futures markets liquid, just more so than some underlying commodities. Some futures markets are highly illiquid and the spread is enormous. An example of this is the Nasdaq 100 Futures pit which trades the "big" contract. The spreads can be huge and "air pockets" are all over the place. On guy told me that on the Friday afternoon before Memorial Day Weekend, there were three locals in the Nadaq 100 pit. Now compare that to the emini version which trades electronically on Globex. Very liquid. In fact, it is used to arbitrage against the pit. The point here being that just because its a regulated futures market does not make it perfect.
5) With the leverage that is envolved, why do you need futures? You can be far more flexible in how much leverage you want to work for AND against you in the cash market.
6) This part here is just personal opinion. Im not one to critisize trading styles if its making money for you. But I would not use the FX market to day trade. Because it can trend so nicely and because of the leverage that can be used, I would use it trade in excellent trading style of Darvas, in which you keep adding to a position as long as it keeps going your way, and when it changes you run like a thief. Darvas describes this style, but the problem is trying to find really long term true trending markets (the junk bond market can do this for a periods as an example)...FWIW, this is how I would use FX...and not to sell some Black Box System...for a fee of course.
Best,
Mike