Thanks for the question Clipse,

This is known as scaling in.  Basically it's adding to or building into a position.  The opposite of it is called scaling out - cutting your position as time unfolds.  Just like everything else, I'd recommend that you systematically test the concept and be sure that you are accounting for risk at every step.  After all, if you scale into a long position, you are increasing the average entry price of your trade, meaning that you could turn a winning trade into a loser.

For example, if you buy 100 BTC at $1, your average price is $1.00 per BTC.  The price goes up to $2 and you buy 100 more BTC.  Your average price is now $1.50.  Let's say price reverses and your exit signal occurs at $1.25 - you lost on this trade.

Here's some general and specific recommendations.  Let's start with specific.  Prior to entering a trade, if you are planning on scaling in, you should select a criteria which designates location as well as the amount you will scale in.  A very specific criteria I suggest is using the Average True Range (ATR) indicator to determine locations to scale in.  I use multiples of it at the time I enter a trade to determine scale in locations.  I use the 14 period ATR for this.  Period doesn't particularly matter, it should just make sense.

Example trade and scale-in:
-You enter the trade long at $3.06 and the ATR at time of the trade is $.26
-Scale in Location 1: Close + 2 * ATR = $3.58
-Scale in Location 2: Close + 4 * ATR = $4.10
-Scale in Location 3: Close + 6 * ATR = $4.62
-Scale in Location 4: Close + 8 * ATR = $5.14
--When price reaches these locations and you have an existing trade, you will buy short another trade unit.  I suggest that this unit be equivalent or less than your initial size in the trade.
--For short trades, subtract the ATR value

General recommendation - every time price clears a prior retracement in the direction of the trend, then you can add to the position.  This is very subjective however and more vulnerable to emotional decision making.

I suggest not scaling more than 4 times.  The idea of scaling is that if the market strongly moves in a direction, you will be in it with progressively more capital.  If the market doesn't move very strongly, however, you will find that you have a higher percentage of losing trades.

A typical EMA weights the most recent prices more than the older prices.  They can be based on pretty much any form of data (open, close, high, low, volume, other indicators, etc.).  You can also shift them forward or backwards so that you project them into the future or lag them even more.  You can do lots with them, but I prefer to keep it simple.

http://en.wikipedia.org/wiki/Exponential_moving_average#Exponential_moving_average

Okay - still a $270 commission.  That is insane.  

For the retail comparison, that's still 27 times a typical commission.

For an institutional comparison: trading with a voice broker like ICAP, you typically pay a $80 commission, but it's on instruments where the point value is $800.

Right, but it does enjoy the liquidity and leverage where you can successfully do that for your account (not something I'd recommend).

with enough leverage & enormous margin deposit one could I guess potentially get 25% daily returns on €/$ (or more likely 100% wipe outs), but this though is so different & harder for the average Joe to initiate as to be not even worth mentioning in this context, where as anyone with a few $ they don't mind risking can do this now relatively easily & basically anonymously via BTC

edit: someone buys $100 worth of BTC at Gox, they pay $0.55 fees, BTC move up or down 25% or more faster than the € can say TU, so how is that few cents going to matter even when it's no leverage 1:1, & @ 10:1 forget it

many thanks    & igualmente  

That's what I was looking at...

http://bitcoincharts.com/charts/mtgoxUSD#rg10zigHourlyztgSza1gEMAzm1g21za2gEMAzm2g10zxzv

I think the fuzziness is due to the fact that markets tend to move in trading ranges around 70% of the time and trend 30% of the time.  The chop is where the discipline of a system trader is required.  I try and follow the system, regardless of how I feel about the strength of it.

If you look back over the backtest of this system on the EURUSD, at one time the system lost 9 trades in a row, but by following it, eventually you would have earned a good profit.

If this was being influenced by lots of people, they would have to be influencing the past 10-21 candles calculating ahead of time what the averages would be (highly unlikely).

Crossover again Taking small hits but as you said this is expected. Currently trading with my whole balance tho.
Isn't good risk management but not really any point of splitting up 5BTC