skigglez unteched it isn't all that useful at gaining information, two players TS'ed the same KD and got wildly different results either earlier this round or during the previous one.
Some players sink time and money into their spell tech tree to get more details from the spell instead of growing their army/land.
Making sure that the wiz:land ratio is based off the defenders land and not the casters will ensure said caster has to sink A LOT of time/money/teching into getting any usable info from much larger kingdoms.
I could also see perhaps a tweek to racial resistances to casting. But that would have to be for beneficial spells as well. IE: Dwarves are historically wary of magic and it's uses, so they are 10% harder to cast upon.