I've been suspecting that about a third of my submissions are coming from one or two webmasters but I've been tolerating it because 1) I reject a lot of their submissions because they keep reusing the same content and 2) they submit all their sites in just a few huge categories, leaving good visibility for everyone else who chooses a narrower niche category to submit to.
I can always level the playing field at a later time if I come to the conclusion that their cheating is dominating the list. It only takes a few moments to delete all of someone's sites from the database.
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