I think what people fail to realize is that these are digital goods and are treated differently than physical goods.

See, with physical, you own it. It's yours. Do with it whatever you want to do. I can go out and buy a music CD and it's mine to do with as I choose. I can make it into a coaster, I can listen to the music on there, I can upload it onto a website for others to download (legality questionable), but the point is that I own the physical good in my home, and it's mine.

With digital goods, they're not yours. The good is still owned by the company, and it's at their discretion what they will do with it. If you buy the same album off of iTunes, you don't own it. You follow the rules of iTunes to use it. If they decide to change the album art, you have no say in the matter, because when you bought it, you agreed that it wasn't yours, but that you simply bought a license to access this service and accept any changes that might come with it.

You buy Aurum items. They're not yours. I challenge you to find any EULA for any F2P game (or any game with a digital item shop, for that matter) that states that items purchased with cash are yours and not owned by the company, hosted on the server, and provided via license.

It may not seem fair, but you agreed to follow these terms. If you don't like it, the EULA provides you an out. I won't link or quote it, since it seems there are many that could stand to read it in its entirety.

Of course it doesn't mean they should, and most companies try to avoid it as much as possible for the reasons you listed. It doesn't mean that it's not necessary on some occasions though, such as a song on the album not belonging there or licensing issues, or more related to this topic, data showing that the contact grenades as they were was causing an atmosphere not enjoyable to the rest of the player base.