In online war games, the sniper is the biggest PIA for the troops to contend with. I can't count the number of players I irritate with my 1000+yd. distant shots... even with the .50cal Barrett that penetrates concrete walls.
In real, life sniper teams consist of a shooter and a spotter and often they are not out to kill someone but rather are very adept at stealth and concealment to penetrate behind enemy lines for recon purposes. Many targets are hard targets, that is vehicles, electrical generators, antennas, etc.... anything that will disrupt the enemy's capabilities. Of course they will also remove key personnel if instructed to do so. After Desert Storm, Army Ranger sniper teams were used to keep Iraqi soldiers from re-amassing along the Kuwaiti border. The sniper would take pock shots at them, keeping them on the move and not being able to dig in. My friend was on one of the SpecOps sniper teams.