Except that if you miss your shot you are left exposed for 2 seconds. That's the whole point, high risk high reward (also costs a fuckton of money so even higher risk and the enemy team can get it)
It's genius game design
Scar is way worse than people make it look like. Costs more than awp for less damage, and most maps have no good spots for it. Also with the new cs it requires you to remove another weapon from your loadout, and all of the others are way better choices for 99% of rounds.