I think is OK but also NOT.
OK because your server will always will be on top as sponsored Server
NOT because if you want to add new server your server will never go on first place, when you add a new topic will pull down maybe other topics.
My opinion Personally is to not make it. Because new incoming good Servers will not have them space to advertise good because older servers are on top...
Think very good if you want to do this. Don't do what ppl want.