Let me follow this up now I've seen the sites you posted.
While there's nothing hugely wrong with your sites, there's also nothing hugely right with them. I'm not trying to be negative, I'm just trying to be helpful. So mugshot wars is like a fun hotornot clone, and leftright as far as I can tell is a hotornot clone, and brainerd custody is great if you want to see pictures of convicts, and memify is probably fun if you're into internet memes and don't use one of the other internet meme generators and you can be bothered to figure out exactly what it does (which the screenshot doesn't make clear) and how to login (which doesn't work for me, mac+chrome, for some reason).
Again, I don't want you to think I'm trying to crush your spirit or anything. It's clear you know some stuff about making fun sites. But these kinds of things are flaky - either people love them and they explode, or they don't and they fade away. But they're all learning exercises.
It used to be that you could put up a stupid animated gif of a singing animal and it would be the biggest thing on the internet. But there's plenty of other stuff to do online now. It's not so easy to make a viral hit.
So I would say that there's no reason that your sites aren't taking off outside of the reason that there's no reason why they should.
But look at it this way: it's damn hard to monetize junky viral traffic, so be glad you're not just saddling yourself with enormous bandwidth bills! Consider all this a learning experience - you're better at making sites than you were when you started, so when you have an idea that provides value for people, you'll be able to implement it well.