Well,I suppose you can claim there's a certain range of sounds that appeal to the human ear. We (generally) like Beethoven's 5th, but not chalk on chalkboard, and so forth. The same probably applies to FPN, except it's harder to decide.

What is 'Pinkberry'? Also, I find it interesting how some fandoms give names to the pairings, and some don't. Why is that, do you think? Or why do certain pairings gain names, while others don't?