I did not say that Paysafecard isn't used in other countries... but in my experience it is not very wide spread in several countries.
In addition, Paysafecard is mostly suited for a "lower age" community not having access to bank accounts or credit cards. So if you ask me, Perpetuum's main audience should be somewhat different.
In a casual game like Farmville the payment methods mainly used are CC (incl. Paypal etc.), mobile payments and prepaid cards (Paysafecard etc.)
In a MMOG the main payment methods are CC, Bank Transfer and own prepaid cards (Gametime cards) although GTC are only available for larger scaled games because of the need of a good distribution...
So as of any MMO that I know of a foreign prepaid card would rather destroy the possibility of an own prepaid card system in the future.
Of course you are right saying that more payment methods will get you a wider range in accessing players and to reach this aim AC should implement several other payment methods. All I say is that this is something for the next few months after finding a publisher who pushes large scaled marketing campaigns into the game to get the game where it belongs.
In fact most of the publishers (not only EA or whatnot) are already working together with several payment providers making it much easier for a company like AC to get better offers for the several payment methods.
Until then, the given payment methods should be enough to reach about 80-90% of all the players interested in Perpetuum after playing the trial.
There are 10 kinds of people in the world: Those who understand binary and those who don't