Since we have not only zeny as a currency but also war badge and cash point I'd like to suggest additional info in @whosell command to show next to price if its in Cash Points/War badge/Zeny. Right now there's not a clear way to check without looking at vendor directly what currency is using. (Screen shows price of dmant)
Usually players who wants to do stuff on aforementioned maps will go there as party starting from 1st lvl/map where they can gather neatly in 1 place. If u add direct warp to mvp maps it'll more likely benefit mvp campers where they can do portal asura or other kind of dmg (portal SS/SBK for bee in example). Its the lazy way so most likely it'll be added as well random warp on map but then it'll hurt more ppl who want to do stuff there as party since they'll be scattered. I'm not a big fan of both tombstone+convex - we could have either tombstone or convex for mvp purposes.