I'm not sure as to how many have already said this, but it boils down to the server/community you're playing on/with. I play on servers run by MILSIM groups, usually on domi, and over the past 4/5 days I have only seen one sniper. Everyone else has had ARs.
Also, the snipers have a downside in my opinion: they're slow. I will not take a sniper rifle to an assault, because when you play aggressively, engagement distance is going to be around 300 metres. If you start fiddling around with a bolt-action AM rifle at that distance, while facing down a fireteam of enemy, you are most likely going to end up dead. It's all about your own game mentality, and how you play. You would select your weapon according to that, and if you want to skirmish with the enemy, then yes, a sniper rifle is the best option, but not for forcing your way into a compound.