Lots of people in Latin America prefer to work with dollars when they can. Look at what the government of Argentina has been up to recently in terms of limiting

Lots of people in Latin America prefer to work with dollars when they can. Look at what the government of Argentina has been up to recently in terms of limiting the population's access to US dollars if you don't believe this. People in high-inflation places can benefit from holding dollars instead of their local currency - and one easy way to get ahold of them is just to accept them as payment for goods or services.