If you played on a Minecraft server, you could see that the server asking you to vote for them for rewards. This includes with this server. CosmicMC itself, has is own rewards for each sub-servers.
The per-vote reward of the Creative server is $10.
Here are the milestone rewards if you vote for a certain times (as in /vr milestone):
Pet Mushroom Cow
|750||Pet Iron Golem|
* Unconfirmed. Not appeared on /vr milestone.
Here are the list of the vote links. You can vote and get rewards by using these links below.