I didn't think they were appearing once a day, it didn't add up. but I know some where its been said. ether buy a mod, starked, I don't know. someone said it I remeber. But I have been wrong before. =_=; I didn't mean to upset you, Firn. I was just trying to fegure it out because it didn't seem right.
EDIT: Found it! This is what made us think this:
starkad wrote:... I'm a bit worried, since by the probability I set, and the pageviews we have, I had expected to have at least one appearance of the fairies per day. Please report if you see one, since I'm also eager to see it's working the way it's supposed to.

The fairies are a permanent feature, they give out one item each time they appear, and we're planning to add more items for them to give out.

Now that I reread it. He must be worried that they might appear one a day, but didn't intend them to be one a day. People must have looked at this thinking they would appear one a day.