PP have never been a problem for me, like scotty110 I have a surplus, though not as great as 5000! All Jobs skills give you PP when you use them, and some of them give obscene amounts, even at level 0/1. Tria are less plentiful, though they are also to be had with many approaches. I imagine some of the repeatable quests are viable, though I've never gone that way. All the cities have mining spots nearby, and if you have the wherewithal to refine them to boost their value, so much the better!
What's more curious to me is that I haven't found a logical progression of steadily (and gradually) more-difficult mobs. It seems like beyond the rogues I'm able to kill, the next step is consumers or trepor (not sure which), both of which are the same strength as me according to the info screen, but they both whoop me soundly whenever I try.
EDIT: It seems I've been unfairly ignoring small animals. Arangmas and clackers (which are plentiful in most places) give more PPs than rogues, despite not being so deadly. :shrug: