Originally Posted by sortie

Could be that nats sites are over-saturated compared to smaller ccbill sites.

From a technical view, if there is some error affecting a certain number/type of browsers
that messes up the sign up form so the surfer can't join then that could be it and it could be a hard thing to find without trying all browsers with all pc types and even connections.

But in that case I would think a sponsor would have gotten enough emails from customers who couldn't sign up to have found that problem.

So, over saturation is more likely.