damn you're being busy
On an oh so slightly selfish note - allow ex-rpc's to still be able to edit the items? That would increase, in the short run, the amount of people who can edit them, and i know various ones who were part way through quests using them anyway, so they'd be appreciative, certainly. On the other hand, now we've been retired, why shouldnt we earn the WP's like everyone else?
For the long run I don't know...you're making the use of the items more attractive to players, and after you've "finished" sorting all the coding out, i would think more people would go after getting the Wish, so the number would go a little higher, on the other hand, there's now not that many WP's (relatively speaking) and they're not regenerable, so people will be less willing to give them to people as rewards, so people will find it harder to unlock that ability to edit.
Because it's a quest addition thing, you could have it in a similar way to the QP, where you have to have given out WP's to be able to do it. A sort of, you've proven you can make a quest, here's some more tools, go play.
I'm not saying to lower the price here, but if there's too few people who can edit the items, why are you talking about increasing the price?