You should moan about the terrible propagation of your group and about the severe disservice these system administrators are doing to Usenet in general and to you in particular. Refer to Question 5 for more detailed information on good rhetoric to use in this post. Alternately, you can post a message pleading and begging news administrators to carry alt.blah.blah. For even better results, post both types of messages. Pay no attention.
Administrators are just godless Fascists.
It does no good to reason with them, so don't try. You're obviously not having any fun. Well, you're wrong because I know all about how this works. If you cared about your users, you'd carry this group. Demand that he call all 500 of his users to find out if any one of them wants to read your group.