Because I totally love servers where 10 year olds get their dad to donate money for admin and free crap (*cough* pulsar effect *cough*).
As far as I know at the moment I don't think an of the servers have any specific groups really set up yet except admins/super admins, but I'm not against the general idea of awarding donation with at least their own group of something, possibly some lowish commands but generally respect for donating from other players. But this is all dependant on how the server owners feel about it, since 3 people own the xuras servers (seperately) as far as I know at the moment.
Actually when I think about it there isn't really any donation system set up yet is there? There used to be when we had the 3 servers originally and only one person handling the server payments.