I think we're pretty good at tracking down cheaters. If somebody is cheating, sooner or later they usually get caught. But I'm sure there are still plenty of cheaters out that get away. I just nabbed somebody today that skated pretty long, and it wasn't like it was such a hard scheme to find and yet he got away with it for quite a while.
With trades, there would be judgment calls about the fairness of trades all the time. It could get pretty subjective at times if there was a fair deal or rigged one. I'd love to see a fair way to get trades here, but frankly, speaking (or typing) as someone who gets to peek under the hood, I haven't yet seen any proposal that wouldn't seriously tax the staff and potentially compromise the integrity of the game.
So never mind my, uh, creative ways of showing that I think a topic is going flat. I actually do appreciate when suggestions come up with the best of intentions. This is what keeps the game lively and where the community can help improve it. If the same topics keep coming up over and over again, we all hear the message, and there's a value in that.
But with regard to the trade issue, I think the general response is still the same. We need some fool-proof idea that will make sure that the proposed improvement won't have serious side effects that more than negate the benefits.
Don't ask what sort of Chunks they are, you probably don't want to know. Blowing Chunks since Season 4!