Here is your answer:
The reason they have not allowed any other payment gateway other than Paypal is because Paypal offers a better service and support than any other gateway. Also because if they add one for this market and another for that market then all of a sudden they have 5 or 10 different API's to maintain and that is not possible right now for the small team.
Paypal services enough of the world just fine and the team is happy for the moment with that coverage. If Paypal does not work for you in your country then contact Paypal and ask them how you can use their service in your location.
I hope that answers your question.
Are you sure you are a volunteer and not a team member?
You speak about importen things that not a volunteer should now the correct answer only they who run this business could answer.
anyways for me paypal works perfect i have no issue about paypal but what i was see several times is that ross did not answer on this and that is strange and thats why i comment this topic i would like to know why they no answer this questions and why a a not team member need answer questions that in my opinion belongs to they who run this business