Inactivity.

To be truthful, as far as I know, Pet has only removed an inactive leader and replaced them with an active one once. That was what occurred last year with Vampiric Elegance. While the coven is now dead due to the current leader's decisions, it definitely isn't the full on fluff fest it was.

All you can really do in these situations is search for a way to contact the priest or priestess, and hope and pray they care enough for the coven to hang over authority. Pet has more important things to worry about then the 10+ dead covens on the site when there are 10+ active covens on the site. Yeah, some covens are dead, but it doesn't mean they always will be. You learn to take what you can get sometimes.

If you really want to change things, join the dead covens, and fix them without the priest and/or priestess, show the mods and Pet that you can actually run the coven, that you aren't fluff, and that you deserve it. Then politely ask Pet to take it over. If he says no, take it in stride. Don't whine and bellyache like a child. If he says yes, then do your job.

That's all you can really do. That or join an active coven.