How much would you charge to write an e-newsletter?

If you want to charge a rate comparably with the market then check and ask in the market, search for already existing ezines in the specific niche the e-newsletter is for, then ask them what they'll pay if you do this for them. By the time you check on 10 to 15 ezines in your chosen niche, youll get a very good idea of the best rate to charge