it was just a simple calculation to highlight the effects of compounding profits on a monthly basis where a consistent monthly return is envisaged.
Clearly it's going to be easier to do in practice if your lot size/risk was based on available capital rather than calculated on an individual trade basis.
I was really just trying to show that in the real world, high consistent monthly returns and straight forward compounding isn't as easy as some seem to think (i'm certainly not including you in that group light!), otherwise all forex traders would be multi millionaires after a couple of years!
I just get the impression from lots of the stuff I read on here that people see a figure (e.g. 50% per month returns) and do a quick calculation in their head and realise they can easily become a millionaire in no time at all, but never really stop to think why most people trading retail forex ARE NOT millionaires. It's easy to forget that (generally) with high monthly returns you have a higher risk profile, so your long term prospects are less stable, and whilst things might go great for a few months that high risk that's helping you win big can suddenly come back and bite you in the backside when you're overexposed and the market goes pearshaped (say for example when an earthquake hits Japan).