They're still an expensive and relatively difficult asset to replace. It's not like they're disposable front-line infantry. Assassins presumably have a fair amo

They're still an expensive and relatively difficult asset to replace. It's not like they're disposable front-line infantry. Assassins presumably have a fair amount of training. If you lose the assassin that's another expense you have to cover. Not to mention the indoctrination required to have someone perform this overseas and come back again.