A sad truth is there are billions of people in this World who make less than $3 per hour. Working a 40 hour week, that's $6240 per year...that's incredible money for some.
I agree. But it's not incredible money to a US citizen whose writing helps other US businesses make sales and pull in profits. As with any business exchange, it's all about the value that's brought to the equation. You can find plenty of non-English speaking writers to churn out substandard copy to pad the content on a website. But if that copy has to move people towards a buying decision, or if it must enhance the credibility of the business proposition, a business owner would be foolish not to pay for the quality that will bring in the profits.