[hoplitis]

When you buy the heavy modern MBTs you must take into account that you might pay for them twice! Once when you buy them and the second time if/when they get killed! What I'm trying to say is that, in my experience, a 500 points casualty might easily cost you a victory level. This is even more frustrating if the opponent has a low tech force in which case to compensate for your one precious destroyed MBT you must kill a lot of low cost units. So "protecting" your expensive MBTs is essential!