About a month ago I launched my first WordPress plugin — the Rixden visual quote builder for service businesses. Things were quiet. 300+ downloads, under 10 active installs, zero sales. Then last week I got an enquiry from a small embroidery business in the Netherlands. He'd been testing the free version and had three specific questions before buying Pro: My instinct was to oversell — emphasise what Pro did include, gloss over what it didn't, push the sale. I'm glad I didn't. Instead I rep...