More then 3billion live on less then 2.50$ a day. They have probably never heard of payments abroad.
You're just plain wrong here. I've been around people who earn less than $2.50 per day and they're not that ignorant at all. They can't afford a lot of the stuff but they've often used money transfer services at one point, it's not that complicated. With countries where a large part of the population is abroad, international payments are very commonplace in all social classes.