jlh | Seamus/Dean: Common? Rare? Anyone care?

Before I say more, I will say: I know, I need to write my

fanfic100 stuffs.

starrysummer is looking for common HP pairings to disallow from a rarepair list and there was a bit of discussion about Dean/Seamus (

legomymalfoy put it on her list of common pairings).

I just want to note that Dean and Seamus:
1. Have not been Potter-puff'd.
2. Aren't on a recent spate of 50 pairing icons which, by the way, included Neville/Ron. ETA: Thanks to

light_music,

nimori added Seamus/Dean to her roster. Hurrah!

Now, I'm not trying to be a Sensitive Negro™ here, but what is up with that? I hate to be the person who always comments on posts like that with "Where is so-and-so?"; I have enough artist friends to know how irritating that can be. But is that the way to get these two roommates of Harry on some goddamned icons, when folks are making mass icons? And surely being consistently left off these kids of things means that good old

deamus is far from a common pairing.

Is this the tragic mulatto of pairings—too common to be rare, to rare to get any love? Is it the bridesmaid of pairings—in the background so often that people think it's common, but never in the spotlight? Or is the tragic mulatto moniker more directly parallel because they're an interracial couple? (And you know, I hate playing that race card.)

ETA:

musesfool, writing about James/Lily on

starrrysummer's aforementioned post about rarepairs, makes a great point about frequent background pairings like James/Lily.

Thoughts?