I am a writer and am independent from any website, but post my ads solely through craigslist. I highly recommend seeking out independent writers who are not affiliated with a large site, because the quality of writing tends to be much better. This is not to say that some of larger sites don't have high quality writers, but quantity translates into more money and so many writers rush orders. At the same time, you need to be savvy with the payment exchange process. Best of luck!