-Real world trading is anything involving real world cash.
Membership can be defined as real world trading, but the awesome thing about membership is that its benefits cannot affect the F2P environment. If everyone who bought runecoins was forced into their own worlds, then that might be fine.
--Loyalty Programme (It's just a bonus for continued membership, but it does give huge advantages in game with Auras)
Now, let's take a look at what you've just said. Auras (Which are a members only item, and can only be used on a members world) affect F2P in no way at all-except maybe a little envy. And you said, as quoted above, that if they didn't affect the F2P enviroment and were forced onto their own worlds, then it might be fine. Can you not understand your contradicting statements?
Difference between that and the cosmetic overrides animations etc., is that the overrides, cosmetics, party pack items, music boxes, hair styles, achievement banner, bank boosters, and dragon keepsake boxes, they aren't trade-able. As opposed the the gold coins, items, or services that you'd buy from accessing the 3rd party websites and using their services.
Bank boosters- Sure, you have an extra 50+ bank spots, which does give an advantage in-game. But the advantage isn't the difference between a 100m bank and a 500m bank or a level 70 skill and a level 99 skill. Those extra 50+ Bank spaces doesn't cause competition against you.