It would be awesome if the model outputs alone were enough for people to figure how much snow they're getting, but as we all know, the model outputs are far from perfect. The problem is that these models run so frequently (and there are so many) that it would be impossible for Pivotal or Tropical Tidbits or whoever have an analyst run through and make corrections for every run, every hour, every day. And so sometimes, often times, you get funky numbers generated that just make no sense and should have no business appearing proudly on their generated product. But they do.
I like the clown maps not necessarily because I think they are going to give me an accurate snowfall total, but they do offer a tangible, visual aid that allows me to deduce trends from run to run. Better so than someone just stating that it came north or the low was deeper, or oh, looks great for so-and-so's house, etc. And I mean, I could probably just use QPF maps to do that, but those just aren't as fun, and this is a hobby to me.
Just my two cents.