One of the things I miss is a list why a static website could be an advantage compared to WP or other online services. Security etc. A FAQ perhaps?
What I is definitely necessary is a showcase of really nice websites made with RW. They have to meet some criteria (like working well on mobile, etc.) and earn a sticker from RW for excellence. Which the designer can use on his/her website if wanted.
Perhaps the users can even vote for a website of the month on your homepage/ showcase so that you have some sort of interaction on your site? You can feature them in your newsletter, etc.