Why to buy ATGM AFVs?

[Double_Deuce]

I try to keep them out of view of enemy armor as much as possible and use them for ambushes. Once they launch I then displace them to another position before they can be engaged. Since they are usually lightly armored they are vulnerable to artillery fire as well so I try to move them anytime they are spotted or after my initial volley of missiles at the enemy.