Yes, a blog mod or the admin may try to feature some of the blogs posted here every day.
You may have wondered why your blogs failed to be featured or why some of the blogs are featured!
A blog mod may tend to feature the blogs that are readable, interesting, with few or no grammar mistakes. Yes, you bet the blogs must be written by MyEC members themselves, not copied from the Internet or plagiarized. Featured blogs may not be related to English learning or teaching but there are some taboos (sex, curses, ads, etc).
You should refrain from writing blogs about politics or religion. You don't need to be a native English speaker, though it's true that so many blogs written by native speakers are featured.
It's up to the blog mods or the admin to choose the blogs to feature, though - it may sound unfair:)
I suggest you keep writing, even though none of your blogs is/are featured - the more you write, the better your English will be.