If they are only ranked by a dozen or so people, the figures don't really mean much. The figures to the right of this page and on every page are probably more accurate, as I assume they represent a longer period than just the last poll survey.
Unless you have a lot of images ie. 2000 or more (acceptable images), it really isn't worth the time to start uploading to low earning sites. The only ones that I upload to from the low earners (on the right) are Cutcaster and Stockfresh, because I'm hopeful of their success in the future and if they do become successful, it will be more difficult to get stuff online with them.