It is my opinion that snipers are much easier to get kills with and that is why people gravitate towards them. The only difference between a shotgunner and a sniper is playing style. Some like to sit back, some like to rush. But they're both the same person.

I disagree. If you can melee someone you can shotgun. Sniping takes careful aiming and position. If you give someone who's never played a FPS before a shotgun one game and a sniper the next. I will guarantee they will get more kills with thier shotgun. With that being said, I am giving you the point that it is more difficult to be a good shotgunner than a good sniper. The nature of a sniper rifle is to do damage from far away. This is why it's easier to be sniper overall. The nature of a shotguns I'd to make killing EASY. Where shotgunning get hard is managing risk/reward and avoiding death.