It's worth it if you have traffic coming from countries that you cannot currently convert with cards. Majority of the world's adults have cell phones but only 15% of the world have access to credit cards. Don't disregard phone billing either, some countries offer better pay for per minute rates than SMS, and you can still grant access with a wallet system by charging minutes to get tokens. Plus, phone billing is a great way to reach your Asian traffic.
SMS is hard to charge back from the user's end. If you go with the right phone/sms provider, you don't have to worry about chargebacks in any way.
Just keep in mind that it's micro billing and micro access, so give it at least 3 months to ramp up to big dollars in those countries.
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