I get what you mean, I thought the same when i first saw it. Someone like me or Sward an Lin is completely missing on it. The mono/poly is doomed problem as it seems. But well, it covers a certain range and I found it amusing as well. But far from being completed, many aspects of poly relationships are missing or portrait in a not so favorable light.
Facts: 30, female, bi, v-type relationship with Sward (husband, straight, mono) and Lin (boyfriend, straight, mono), poly-fi and co-primary.