I wonder if maybe the traffic for that niche is too much "Indian". Knowing CC companies, and their foreign CB rules, it could just be a matter of the surfers not being able to signup for the sites. I see it in happening in some other niches that tend to be European or Asian surfers.
I also read an article a long time ago(on AllOfEm, I think) on using different color schemes for different ethnics. The one that pops to mind was that in India RED stands for virginal, therefore the red wedding dresses, etc.
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