I think OP meant problems with setting up payment method, dealing with credit card etc.. Most of the world population can not even pay with usual visa card.
There's that. But there's also a big psychological barrier to paying anything at all (even if you can whip out a credit card and pay in a minute) vs. paying a bit more. Is that barrier greater than an additional $99? I'm not sure in general. But it's probably bigger than paying an additional $3.99 or whatever.