Look at it this way: a dead soldier costs a lot of money, yes. That's a lot of money spent training the soldier, and a lot of money for reimbursement. Troop morale can go down. It costs a lot more money, though, when the soldier is maimed because you need to pay for the hospital bills when the soldier returns, which can include costly and lengthy rehab. You also need to pay the soldier welfare if he can't work (which is likely). Finally, if a soldier falls in combat, his comrades aren't likely to secure the body until after the area is secured. However, if he is simply wounded, his comrades will likely rush to him to secure him and give him the necessary medical attention to make sure he survives, leaving them exposed and unsafe. Even if they rescue their comrade, and get him back, the sight of a soldier wounded by a mine is pretty demoralizing to a unit, and can do much more damage than a dead soldier. It's pretty disgusting.