Board Thread:Questions and Answers/@comment-24385143-20140111195955/@comment-24145588-20140112195722

Just to extend a bit on what Xabidar said: The Gold Island is also a special case because no coins are earned there. So, a creature can be on its original "natural" island, earning money, while it is also on the Gold Island contributing to the music there.

In the cases of both Shugabush Island and Ethereal Island, monsters moved there are still earning coins or shards. Having them on two islands at once, e.g., your Ghazt on the Plant and Ethereals Islands at the same time, would mean one monster earning money in two places at once.

Any further islands that use the "bilocation" method of the Gold Island would also have to be non-earning islands.

I would like to see the ability to place Ethereals on the Gold Island once you've leveled them up to 15 a second time, although that would require the developers to come up with new music for them.