Although it is possible to day trade for profit, the bid/ask spread involved makes it necessary to trade larger lots to reach the $500 level referred to above.
At the IMM/CME you pay a broker commissions, plus the spread, usually 2-3 points. On FX you pay the spread in and out. Basically amounts to the same transaction costs.
A very important point is FX is 24 hour from Sunday evening to Friday evening. If you are a trend follower, much of the direction is determined at the close of Tokyo-opening of Europe and Close of Europe-Open of New York.
Trading currencies is very difficult, as they react quickly to Economic data around the world, which leads to chasing the highest yield, coupling with an appreciating currency.
Since there are regularly 30 to 50 pip swings, fundamental analysis/projection, and "position" trading is only for those with VERY deep pockets, who can bear the large losses without tight stops.
An even more interesting point is that currencies do not seem to return to the mean [linear regression]. They typically continue towards over extension versus pulling back against fundamentals. [See George Soros - Alchemy of Finance]. He states he could not make $ consistently, trying to pick tops and bottoms..i.e. regression/contrarian, that the trend tended to self fulfill to extremes. We have found this to be true.
What to do? We use elliott wave analysis to get a daily/weekly/monthly bias and then use proprietary tech indicators to enter on pull backs against the bias direction with very tight stops. Our stop management is key to success.
In summary, you cannot simply buy high and sell low, because high tends to go higher and vice versa until total capitulation and triggering of lots of stops in a big gap reversal. It's all to easy to get caught in this without proper money management/risk policy. $500 per day is possible if you trade over one million lots, which would require at least $75,000 in capital, and really needs $100,000. For most smaller retail investors, it is more viable to shoot for $100 to $200 per day...taking more when things run your direction [like Euro last three days], and avoid losses/big gaps.
cmbfx.com