You are forgetting one very important thing: At one point, Snape/Harry was a rarepair, too. ;-)
Just give fandom some time...I've been in fandom for a while, and when I started out, there were about five Sirius/Harry fics in total. Now look at that pairing...it can't really be considered a rarepair anymore, methinks. The same goes for Remus/Harry. Just to name a few pairings I've always loved, read and written, even when hardly anyone else was interested in them.
Of course, another major issue is that a lot of people just aren't that interested in the minor characters in the books. Some of those characters are little more than a name (Blaise, anyone?). So, yeah, I'm not surprised that characters who play a more central part in the books (Harry, Ron, Sirius, Snape, etc) have more 'fans'. I'm certainly someone who's very picky about minor characters, and thus there are plenty of rarepairs I don't read or write. But on the other hand, when I have an idea for a story, I'll write it, no matter how popular a pairing is or isn't.
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Just give fandom some time...I've been in fandom for a while, and when I started out, there were about five Sirius/Harry fics in total. Now look at that pairing...it can't really be considered a rarepair anymore, methinks. The same goes for Remus/Harry. Just to name a few pairings I've always loved, read and written, even when hardly anyone else was interested in them.
Of course, another major issue is that a lot of people just aren't that interested in the minor characters in the books. Some of those characters are little more than a name (Blaise, anyone?). So, yeah, I'm not surprised that characters who play a more central part in the books (Harry, Ron, Sirius, Snape, etc) have more 'fans'. I'm certainly someone who's very picky about minor characters, and thus there are plenty of rarepairs I don't read or write. But on the other hand, when I have an idea for a story, I'll write it, no matter how popular a pairing is or isn't.