[johnnyanmac]

>when you're moderating a subreddit you get tons of people who are here just because your subreddit was crossposted somewhere else, or suggested in their feeds.

that's called the front page, and you're right. when a post hits the front page (reddit.com, not your specific sub) you get flooded with low quality users who don't see a sub, but a post. it's why you may see the same trend of responses across a myriad of topics, because they are coming from the front page and carry their own axes to grind.