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wow that's pretty heavily into  conspirast theory .

you think  there's losers  that really do that???

why ????

who cares if you  top  the coments  hits  chart?

is that  going to  get you  a job or something?

 wow if thats  true, Sivana,  that's  cra- zee.

Actually, it is true. There have been many cases of that sort of thing happening here in the past. I don't know if they watch IP addresses here and ban clones, but I doubt it.
So I can't point my finger at any one example and say, yeah, that's a clone worshiping himself, but people being what people are, you can count on it being fact that it happens here and happens a lot.
I believe that most (if not all) of the contests are now judged by moderators and coordinators. I'm not sure since I rarely look at any of them but it seems to me the last one or two I checked out weren't open to public voting. They used to be though, before countless allegations of cheating.

Is that going to give you a job or something, you ask?
Well, maybe, maybe not. They do have categories for Most Viewed, Most Commented, and Best Rated, and if I were looking here to find someone with a style I needed in order to commission someone, I would probably look at those categories first.

It's not really conspiracy theory to expect people to lie and cheat and misrepresent, especially when it's a matter of popularity and potentially money.
Look at some of the examples of blatant theft of copyrighted meshes and whatever else by merchants who have attempted to pass other's work off as their own. There have been many examples of that here over the years,. While that's an extreme example of desperation, the fact that it has happened (and will continue to happen)  suggests the probability that many many more minor offenses occur unnoticed, such as people using clone accounts to boost their stats.
I wouldn't say everybody does it, or even a majority. I'm sure those who blatantly lie and try to cheat the system are well in the minority, but it would be a very safe bet to make that it does happen and happens frequently.