But you dont lose all if you fight until the end.
If you have maybe 40 Towers. You will lose 6 then war ends.
In the moment if a stronger realm attacks you, you will lose all your good towers until you relocate and lose all. I dont calculate but I think building up again cost you more then 20% tribute.
And if you are not the worst realm of all there are also weaker or equal realms you can fight. Win and get towers and Tribute from them.