250 countries?
how many countries exist in this world?
The problem with PayPal is that it is so widely accepted. You can pay almost everything with it - some shops/people even take payments exclusively from PP. The next real alternative would be Moneybookers/Skrill i think (correct me if I'm wrong)...
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The best alternative to paypal is merchant accounts. Everybody has some kind of CC or debit card. Paypal is just easier to get a seller account with, thats why so many people flock to it. Anyone with a real e-commerce business should accept credit cards without paypal.
Paypal is fine for person to person, but if your business relies on it you will end up sorry.
All these alternatives also need the buyer to sign up, and that can be a deterrent.