Themes and Skins are a bit different though, in that they will get posted to your lirary, but there is a mean level rating ( I forget what it is) for everyone to see it. Though level 3 or 4 and above can see them rated as low as they can be rated. It gives someone who isn't at a level of skill for the mean level to have others who might help out with comments and such the chance for that avenue. It also means that there is a bit more control in theory because higher levels mean a person has put more time into being a part of the community and site.
At least that is my simple reasoning for the levels being such as they are. Have to read up on it again because I know I have three or four times, but always forget.
