I do solo book runs quite often; always supply the stone + 200p, and explain very clearly that they need to gate immediately after they zone without any hesitation. The book, by the way, is a small fraction of the Ragebringer quest.
Sky ports shouldn't cost that much because there's no risk, although it does strip your buffs and you have to jump into East Freeport to get out. I'd say 100p on top of the Sky stone is fair.
|