Writing is not as easy as some people say it is, whilst it may seem easy it does take a lot of time and you also need certain skills such as grammar, good spelling, and also in most cases to be able to write in fluent English as well. In terms of how much someone should be paid for writing, it really depends on the extent of the work and also the quality. I remember once when I was writing articles quite a few years ago now, I was getting paid about $5 per article but they only wanted small articles so that made sense and for the work I was doing, $5 seemed right for me. I would say something like a 1000 - 2000 word article would be worth around $10 - $15 but I haven't done article writing in a while so I am not 100% sure how much people tend to pay out for work of that length and good quality.