What kind of 'interest' are you looking for?. Initially I suggested this when you were about to start your demo contest and there were quite a bit of people rooting for the live contest idea. If you do it, people will join.
HIGH RISK WARNING: Foreign exchange trading carries a high level of risk that may not be suitable for all investors.
Leverage creates additional risk and loss exposure. Before you decide to trade foreign exchange, carefully consider your investment objectives, experience level, and risk tolerance.
You could lose some or all of your initial investment. Do not invest money that you cannot afford to lose. Educate yourself on the risks associated with foreign exchange trading, and seek advice from an independent financial or tax advisor if you have any questions.
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Past performance is not indicative of future results.