Recruit-A-Friend System on Lordaeron
This is inteded for later on, when you can level to 80 atleast.
The ability to pay a fairly small amount ($5-$10) where you link your account with another new account, no previous characters etc. You get 1 month of 3x experience and the "summon friend" ability, just like retail used to be. You can then after the first month, extend the 3x exp etc for another $5 or $10 however this time the linked accounts get the Swift Zhevra mount.
On retail you got the mount when the person who got recruited purchased atleast 2 months of gametime, i think atleast. But since its a private server this will have to change. Instead we pay a fairly low amount of money for the (close to) same rewards as retail had. I think it's a great way to get your friends, or others, to get in the game easier and also supports the server and its staff.
It should not be expensive as i think a low cost will make more people take advantage of the service.