Guarded town transportation:
I'm all for convenience, if it plays nice with existing mechanics. I'm afraid this system, in the form it's suggested, would make moongates completely useless. If this system was to be implemented, I think 50-100gp is way too small fee for it. Moongates are the system used currently if you don't have a rune from one town to another.
Dungeon transportation:
I like transportation from dungeons to Casino in certain cases. I dislike the transportation to dungeons from Casino. NPC outside dungeon transporting you to Casino, if you are dead, would be convenient. It should have a fee deducted from your bank and transportation is only possible if you are dead. That way if you die you can pay for the convenience of getting back or leg it if you don't want to pay. I don't like transportation from Casino to dungeons simply because it discourages world exploration. Maybe, if there was a significant fee to it.
Unguarded town transportation:
Same as dungeon transportation. Most of these towns are kind of out of the way. Ocllo on an island, Papua and Delucia in t2a, Serpent's Hold accessible through dungeon or by boat. Transportation between East Brit to Casino is just pointless.
TLDR; Needs a hefty fee, if implemented. Money sinks, go economy! What's this ferry system? I've been away for a while.