Human Advertising.

What about gifts for people who do constant advertising. posting on their facebook/twitter/etc [with xx friend/followers requirements], using warmane.com as their names in popular online games like agario n such, mentioning warmane in their streams that aren't wow related, etc.

Warmane can advertise themselves if they want to, or encourage current Warmane streamers to do that if they want to. But the reward will be more people playing that might result in more donations, better servers, maybe more scripts etc the chain goes on.