I recently discovered this feature with account summary to easier track the gold I have across my different realms but I noticed that some of my realms were missing in the list that only have 1 character on that specific realm so it won't show up in the summary list with the gold it has, adding a level 1 random char to that realm is a workaround for it to show up in the list but would be great if you could make it so ALL realms show up in that list for gold tracing purposes even if it's only 1 character on the realm :)

Also 1 more thing I noticed with the summary is that it doesn't get updated if you mail gold? I sent some gold to my other alt on same realm and it showed I had 2.8m in the summary on this realm but in reality I have 2.1, relogging on the char that mailed the gold fixed it tho.