Did you give up reading my post after the fourth word? I didn't say "there's nothing wrong with Envato", I said "There's nothing wrong with Envato choosing not to accept sexually offensive content, and there's nothing wrong with Envato deciding what they want on the site" which is most definitely not a false statement.
How else would they do it though? It's the same with whether an item is good enough to be accepted... you can train people all you want on what the company wants, and what they don't want, but that's all going to be based on items that are live on the site or have been sent in for review... the actual decisions are going to have to be made on a case by case basis. You're never going to be able to get a group of people to make exactly the same decision when it comes to approval or rejection.
They'd need a computer program for it to be a completely level playing field, and I think that's probably a long way off.