Features to offer premium members?

My server has outgrown itself and I have to upgrade for the second time in the time I've had it. The new solution is going to cost a bit more, so I'm considering something a user here told me in another thread, to let players pay for premium features. I've asked my most loyal players and they seem keen on the idea. But what should I offer in return?

My current list is:

1. Permission to create factions in a new Factions world
2. No portal fees
3. A NPC bodyguard that follows the player
4. Some Craftbook permissions, like putting XP on bottles
5. Custom name in chat. Whoa :-D

What else is usually included?

Side question: Does anyone have experience with karahost.com? They offer a good deal on a 4 core/4 gb KVM VPS in Ireland, which I think should supply me with the power I need.

 

1. If your server is economically based, monthly payouts? e.g 200$ in-game currency.
2. Possibility to add a few extra home locations
3. Possibility to start their own shops.

 

I like number two, at the moment players have no way of teleporting except to "official" portals. Number one won't be attractive. My server shops buy mined materials like stone and dirt to get new players started and make it easy to earn money, just by playing, and my most active players are already too rich for it to matter. Number three is not possible as I already sell shops in the server shop.

But maybe a better gold sink would make #1 worth including.