While you can still build a shitload of edge points with PK and exploration (I should know, I have 4 edges with no role and no IMM xp, with tons to choose from), you can also "luck out" and get lots of IMM xp and have a leg-up on other chars.

It's too subjective. And this coming from someone who gets lots of love from the IMMs (well, mostly...thanks again to the Immortal who talked to me right before I deleted Vhergruhl, and thanks to Valg and others who suggested doing something out of sorts for me (A pure explorer char)).