Should there be a levelling system for alliances?

I think alliance benefits should be linked to land controlled.  It would then give alliances something significant to fight over while also allowing for alliances to have big surrender terms that don't get absorbed by a few players exodusing 10 cities each out of the enemy territory. 

I don't know about official levels, but something like an alliance bonus/discovery for doing well would be fun. There are already lots of alliance ranks (trade, land, military, etc.) Perhaps the top some number of alliances in each category could get a boost in that category for their excellence. e.g. top trade alliances pay less tax in trading because of their reputation or else gain some new trade ability like trading with the centrum npcs, top land alliances get a small price decrease for sov or a discovery type thing like the ability to make an extra sov structure...

That would give reasons to strive more for the ranks which already exist. Or, if you wanted to make it less competitive, you could have a fixed goal the alliance has to reach (and stay at) in order to use the bonus.

Other: there could be leveling system for alliances but it should be Alliance experience dependent. To get elevated level you alliance would need Alliance experience points. Alliance experience points you would get  by how long it has existed, how many members it has, from results in tournaments, results in events, attack/trade/defense scores and population and land accumulated by members in the alliance while being in the alliance. 

Then the leveling up could cost significant gold and prestige also.

To the other topic what the levels should do is not any boosts but perhaps freedoms in the diplomacy and other stuff.

You could form more elaborate agreements with other alliances with details you could set your self.  In form. Time/escrow..
Moving cities between players inside the alliance.
Moving units between players in the alliance.
Large resource transfers between players in alliance.
Get larger and larger Alliance sovereignty areas

I'm not convinced if we need any levels for alliances just playing with the Idea as I would like it.

Perhaps one benefit for each category.  I suppose it would have to decay otherwise big old alliances would rule.