You gotta be smart about it. Set your bindstone where you're leveling, go back to Einhoren or Dhan town, do your business, store all your crones in Safe and then get yourself killed by a patrol. Free trip back. Or buy a bunny.Armour averages you about 60-70 crones, accessories about triple the amount. May vary at 50+, but ye when you're 50 you already pay over 5k per trip.
I'm not opposed to lower crone rewards from NPC-ing, but for the love of RBF, do something about those portalcosts. It's ridiculous at those levels.