The remoteness of certain battlefields discourages people from joining in.
Running for 30 mins is not fun.
Maybe give the orbs single-use, party teleport abilities like the Moogle Fan Fest items.
This will not break the game. If people want use seals just for free teleports then let them.
Thanks.
P.S. People that have not purchased the relevant expansion should not be warped. If the developers need a way to check if a player has access to a zone then add a Key Item that can be checked; same as teleport spells. Don't do what you did with the Nexus Cape which was just plain lazy.