I don't comment everyday but yesterday for example I commented a lot of photos and today I wanna comment more ebot's of uploads of my favs which I haven't commented yet. Also I voted for the photos that I liked without the word "vote" in the comment. Some photos that I voted are in the hot20 like yours Raven and Cyn and some photos aren't in the hot20 but I considered them very good, like the two last uploads of Michelle for example. I think that the limitation to one vote is not practical because when do I decide which image deserves the vote? And I'm sure that after voting for one image I'll see other image that I like to vote for it. For example, yours (Thomas and Cyn), which is better? Are different photos and I like both in their styles and I vote both.
About the users with multiple names I think that this is a problem of Renderosity and I wrote about this in other threads and I proposed solutions, but anyway they are cheating themselves.
Thomas, I think that the limitation of one vote/day in the hot20 implicates to decide what image deserves it, and this decision is difficult because as I said the images are very different.
I valuate my images for the viewings, comments and votes. Yesterday I uploaded an image, I saw a few comments (btw Cyn, thanks for your comment) and no votes, and in my interpretation the image isn't good as I thought but I liked and appreciated especially the comments.
Now the votes are absolutes, but with the limitation they will be relatives to other images uploaded the same day. For this: let me to vote for the images that I like without limitations.