Google is getting VERY good at catching spun content so you'd better be talented at manual spins. If they DO catch you, of course they'll spank you... and hard. So anything you use spun content on is inherently AT RISK. Worse yet... Google gets better at finding spun/poor content every year. So in the longrun you're screwed. I'd weight your other options and see if you couldn't find a cheaper source for manually hand written content.
I am extraordinarily dissatisfied with WordAI. They are happy to take your money – we spent a good chunk of coin, but also sent in two support requests that were never answered. In the end, we told them that we had to like their AI and their humans before we’d continue trying their service, so this article, which is a great analysis of the products shows that there are other spin services our there and we will definitely be trying out the competition.
Anyone can do this, all you need is a computer and the ability to string a sentence together. You can write original articles and submit them to article directories and get paid. You have to apply to these sites and may or may not get turned down. If you should happen to get turned down then just keep plugging away until you find someone to "hire" you.