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The last time we made a custom change to one realm it was eventually overwritten by a commit that was pushed to all realms. By eventually I mean about 3 months. It's difficult to maintain custom changes per realm when we're updating all of them at once. The vendors are stored in a table where we don't overwrite changes on update but the same can't be said about item templates. I'm not saying it'll never happen but it's very unlikely due to how things are operated at this time. However, the point has been made that since conversions now properly happen when faction changing we could convert remaining mounts on the wrong factions. Also, these mounts do exist on Icecrown because they were obtainable via points in the past.