Why would it not be possible? It is possible, especially with forex sites affiliate programs (e.g. http://www.etoropartners.com/ etc.). It would be even better if you thoroughly trialled and evaluated all free and paid and affiliated and other forex service providers, and give marks or propose the best one in various categories.
The actual clue here would be: instead of linking to their sites, become one of them and make money as they do. Something along that line anyway.
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"It is a profitable thing, if one is wise, to seem foolish." --Aeschylus
Nice blend, particularly the link units - This could make good money but you have picked an ultra competitive market to enter. The keywords pay well but that's because the competition on the adwords side is so fierce.
Cheers
Dickie Boy
