@ahkwardkat Kat, I love you, but... erm, are you feeling okay? I know fanart is a touchy subject, but if people want to do it, you can't really stop them. Jono is still sort of figuring out what's best for his comic, and if he wants to comment on what's hot right now, he and anyone else is free to do so.
I know you personally feel you want to be known only for your original work, but... not every artist is this way. Many use art as a way of expressing their love for something. Just like you likely express your love of birds through your comic's characters, others draw art of their favorite things too and enjoy it just as much. It doesn't necessarily mean they're selling out.
Some people honestly like drawing porn. Others really like drawing game or anime characters.
Is it easier to get popular this way? Yes, certainly without a doubt, but that's just the way of the world. I think it's great people can make money doing what they love. Heck, if you can make money making art that's an achievement in itself!
So in short, artists will make art. Whether you want to carve your own path with originality or just have fun making art of things you love, we're all out to have fun with the medium in our own way. : > If people are honestly making art to only sellout their skills, ehh, who cares? I'll just be over here improving my own craft making both fanart (because I like to) and making original stuff too!