Hi, I am developing a new system for wordpress which have never been done before. I need an idea, it that fine to charge people for my product? Will people buy it if they need that.. I may put a little price ($20 to $30) but I know my system will be a need of 90% of all bloggers. Should I launch it for free and charge for aditional sub-modules? P.S, Can i use "Wordpress" as a part of my domain name? Thanks