Forex isn't nearly as popular as stocks, but some people still invest on it.
I'd say mid $xx undeveloped. I'd look at trying to affiliate with the forex-based stock program that's advertised on TV (infomercials) now. One sale of that program should be more than its value undeveloped.
I'd also look at pairing it/linking it up with a stock market based domain, which could promote the stock-based programs (advertised on infomercials), since they seem to be more popular.
One of your best bets may be to write articles, I think forex is a tad undercovered in most publications.
Only caveat is that the stock/forex programs seem to all run about $4k each. I think that's why they have to sell people on it at the free workshops. Still, this means that the commissions should be amazing if they have affiliate programs.