Even though it is listed as #17 in the top 20 ratings, it is actually tied for 8th with a rating of 8.16 (several others also have 8.16). There are some great pics in the top 20. Love the kitten sleeping in the dustpan.
I can't say for sure but I would think that in order to make the top 20 you have to have a qualifying number of votes. All of the pictures in the top 10 have over 250 votes. Being that the pictures seem to come up at random when you are voting and there must be just thousands of pictures, I would imagine it would take a very long time to accumulate 200 votes. Some comments/votes go back as far as 9 months.