It definately draws most of its vocal fans from people who are afictionados of Insane Clown Posse, which makes the self-evident point that your fans are going to be drawn from the people you market to. It also makes the secondary point that those people are going to come to your game with an attitude towards playing it that reflects that marketing.
For instance, most RPGs get judged based on how they measure up to other RPGs (because they're marketed to gamers.) Morton's List fans, at least on the Web, do a lot of talking about how it let them go out and do silly hijinks and made them feel like wild and wacky Juggalos or Juggalettes. And the game facilitates that, so it's popular with them. (Arguably that's all it does, since gameplay involves "get a group of people together, roll a d30, and do what comes up on the list.") Somebody could probably write a Forge post about how it illustrates that games are often successful by reinforcing preconcieved notions.
On the downside, while the options of things to do in Morton's List are often vague enough to interpret in different ways, plenty of them are intended to be illegal. (Or close enough; considering its target audience, I doubt the activity "Enjoy the wonders of the vegetable kingdom" means eating a salad, and several read like the kind of things that LARPs tell you *not* to do lest you risk a night in jail.) I can see why that, combined with the fact that there's no real game rules, would keep them out of the con.