>>/8250/
I suppose one should ask, what is a fandom? I mean, somepony like Fresh Coat even getting a few fanworks about her and is certainly less than Seaponies yet people wold say she had a small fanodm. I have seen the same said for the few middle tier latter day background ponies that inspired some attention. 

Maybe few have a dedicated taste for them, but there are things in this fandom that are regarded as having one that Seaponies are ahead of.