iron
i don't mean to speak for stridar, but i believe what he's referring to is something you have not yet experienced - you've not finished the game yet, correct?
those lovely teleport stones will disappear somewhere along the game, never to be seen again. <img src="/ubbthreads/images/graemlins/puppyeyes.gif" alt="" />
this not only makes the end act(s) BFs long and drawn out but the after-game continuation unappealing.
if there was an option for purchasing said stones from a BF merchant, even after the game, it would make replaying (or continuing) the BFs a decent idea. without these stones, it's a laborious hike back and forth causing (i believe) a quick lack of interest in proceeding.
stridar, if i've not stated it correctly, please elaborate.