Aaron and I have been doing business together since the summer of 2012 and coincidence or not, the revenue of my business has quadrupled in this time. We recommend Spin Rewriter to all our members in our newsletter and it's been by FAR the best performing affiliate product we recommend. I think we did over $4.60 EPC with one of our earlier mailings. We've never heard of anyone requesting a refund so all in all it's really a fantastic product which sells itself.
For this purpose, humans have created numerous rewriting tools to save time and use all words available in the English dictionary. Rewriting tools use millions of synonyms made available to them through artificial intelligence and instructions given by the human mind. If you hire the services of a content writer to rewrite/create content for you, they will charge you a lot. Big organizations can afford this but small startups and students can never afford the services of professional writers.