Originally posted by 絶滅:

thats a lot to read so ima just say what i heard they want you to use the boats period if you could portal metal there wouldnt be lot of reason for a boat other then island hopping but sence you cant portal metal boats actually have a extended purpose

Originally posted by ledRid:

The only purpose for not allowing it I can think of is to force you to use boats more if you are getting resources from other island, but if that is the case you could probably implement a way to only be able to teleport across land and not across ocean biomes :T.

Maybe i'm wrong but I don't imagine it would be all that hard to do, especially since (from what I heard) the portal system works by physically moving your characted to the other portal