Let me give some history to put this in perspective.

During beta and when servers 1-5 were launched
We had 5 realms each with its own cities
We had competition within each realm over the cities for a while until the dominant guild arose to take over the realm

This continued on servers 6+ for a while

everything was fine.

SOme of us thought hey we are going to have 1 guild in every realm that owns everything. Maybe we need some inter realm event where the big guilds can fight each other. This type of idea was suggested on forums.

Then things started to change.
Servers began only having 3 realms
and 11+ had GWF changed so that it was inter realm warfare.

Personally I like the original model we have on servers 1-10 But would like to have the top 5 guilds battle daily for something like coins/credits/rep/exp - NOT ANOTHER BUFF

Then have this applied to all servers.

Its a very simple solution. Go back to what we had originally add a new event and be done.
Don't even bother asking what this event would be - It doesnt have to be complicated. - Believe it or not Im out of ideas for today

This takes NOTHING away from anyone
doesnt just hand things to people
and promotes competition.

other then that like i keep saying attach the buffs to the guild level instead of a city