Rates for writing this sort of stuff are often around the $5 for 500 words and I've even seen one poor soul offer to do it for 1.50. Most of these guys are from Pakistan, India, the Philippines etc and I suppose are just trying to earn a few dollars but you pay for what you get.
1$ per 100 words - it shows :-(
Unfortunately I know of a few working photographers, who've been taken in by the 'You -must- have a blog - We can write it for you' routine.
One in the UK was mentioned in an offer I received, so I thought I'd give it a look (I'd seen his work and like it). The written quality was awful (not a version of English I'm familiar with), so I phoned him up and asked if he'd ever read what was being published in his name? He'd read the first two posts and they were fine - banal, but reasonably written. No.3 onwards were obviously passed to the 50c writers...
When I asked why this stuff was in his name, he said that his web developer (subsequently fired ;-) had said that a blog was 'vital' and would arrange it. Like many photographers, article writing and all that 'marketing stuff' was just not something he was happy with...
I'm inclined to wonder how many would pay for someone else to go round taking photos (at 10c a pop) to pad out their site?
I'm involved with several business groups in the UK, and have seen interminable 'social media marketing' presentations, but also a healthy degree of scepticism from audiences, none better put than one guy in manufacturing, who simply asked why he should let his staff mess around on FB all day when they had real profitable work to be getting on with ;-)
It can indeed work for some, but for far more businesses it's a time and resource sink