You have a math error.
A higher percentage rate of 1/10 the income, doesn't mean they have more to invest. In fact, food is stilll 30% of their budget. And as always the savings is power-law distributed and most of the people in the developing world have very little savings because they can barely meet their basic consumption expenses (and they've gotten a taste of materialism and spend to join the lifestyle of westerners).
No I don't have an error. I'd bet an average Chinese has more to invest than an average American. This works on both personal and on a country level. Who is the largest debtor nation of the world? Who is the largest creditor nation of the world?
The developing world is not China any more dumbass. You are like 10 - 15 years behind the times.
China has already banned Bitcoin for use as a currency.
If crypto-currencies will be for investment only, they are useless.