What you're suggesting has been tried before with other subreddits, and unfortunately it doesn't appear to work that well. The reason why it doesn't work can be traced back to the karma system and the silent majority of the subreddit. I've been on reddit for a while and have seen shit like this happen before, so I'll try to provide a detailed explanation of why it won't work.

First, lets go over what is going on here. People who post shit like OP (and the post earlier about a fucking foot stool) tend to post easy to digest, low quality images in the form of links. So, OP's post is sitting in the new tab. The new tab is often filled with a large number of people who are just looking for quick, easy to digest stuff (or the knights of new happen to have really bad taste). This silent majority chuckle, upvote, and move on all without checking the comments or subreddit, and OP earns a bunch of karma and goes off to make more low quality submissions. Meanwhile, the smaller, more vocal members of the community see the post as it reaches the front page and begin complaining in the comments and down voting the post. However, members of the silent majority who don't happen to browse the new tab also see it and upvote it without bothering to look at the comments, thus securing it's position on the front page. (EDIT: This is a common phenomenon, and has been discussed numerous times in theory of reddit and other meta subs.)

Now, let's imagine there's a separate subreddit for these fluff posts. Ideally, everybody who likes fluff would sub to it, and all fluff submissions would go to it, thus creating ideal environments for serious discussion and fluff. Sadly, the silent majority, and to a lesser extent, the karma system come in to screw up this happy little setup.

First, I'll discuss why the silent majority creates a problem. Most people who only vote (or only comment infrequently) tend to have a very simple voting pattern. If they chuckle, or dawww, go wtf, or get outraged, they upvote and move on. This is frequently done without checking the subreddit that the post is in. This is why you will occassionaly see something more suited for r/funny in r/wtf, or something better for r/pics in r/funny. So, if one of the fluff posts winds up in the serious subreddit, there's a good chance that it will still get upvoted to the front page unless the mod team happens to remove it (and given how upset reddit gets about FREEDOM OF SPEECH when any actual moderation gets done, this is unlikely to happen in most subreddits). Additionally, a significant portion of them may not even care enough to subscribe to the specialized fluff subreddit. So, for our hypothetical scenario, lets say none of the people who dislike fluff sub, and only half of the silent majority sub to the new subreddit. This creates a subreddit significantly smaller than the parent sub, which, when paired with the karma system, leads to our second problem.

Problem two: karma. People looooooove karma. People take those nice little imaginary internet points very seriously. And people who tend to post fluff tend to do so for the easy link karma. Now, as I said in my previous paragraph, the fluff sub is typically a lot smaller than the main sub. This creates a problem for our intrepid little karmawhore. They want to post fluff and get lots of that tasty karma. But, the fluff subreddit only has X number of subscribers. But hey, the serious sub has X*10 subscribers, and some other guy got a fluff post to the front page the other day. So, he posts in the serious sub, because more people equal more karma. And unless there's strong moderation, the silent majority will see the fluff rise to the top of the serious sub. Take for example r/funny. You'll often see reaction gifs with "how I feel when" titles hit the front page. There happens to be an entire subreddit dedicated to that stuff (r/reactiongifs), but funny has over 2 million readers, while reactiongifs has all of 65 thousand. That's a huge difference in potential karma! (Something similar can be seen with askreddit despite the lack of link karma, where most of the posts should go to self, storytime, or DAE, but get rephrased to fit the basic guidelines so they can get more exposure and attention).

So, yeah. While it's a nice idea and works really well in theory, the way reddit works in practice prevents it from being successful.

EDIT: To support my claim a bout a silent majority upvoting fluff content, look at the karma scores on whatever happens to reach the front page. Images tend to have disproportionately large numbers of upvotes compared to self posts, even though the self posts that hit the front page tend to have a large amount of quality content or discussion in them.

tl;dr: Won't work because people have shit taste and like karma. I've got a bunch of free time, and have wasted the past 5 years on reddit, so I've seen it happen before. Also, I'm really bored and can't play DotA right now, so typing this monster of a post was fun.

If you actually read all of that, I love you. Also, woohoo the Lanaya flair got updated