I got Adepts running out of easy initiations, which would have made 20 karma at chargen (and spending a few more on getting a quality aftewards, so basically a price of ~25 karma) actually worth it for saving a total of 1+ PP. Granted, I allowed them to start with extra karma spent, so they easily got 3 Initiations (didn't allow more), but the guy who's currently almost at 5 is really restricted already. Only reason he got that far was because I allowed the Nine Paths to serve as a replacement of the Arcana+Intuition Extended Test, since there's 45% max chance to make that roll, and only the first few Paths. Without that ruling, he'd already have had to pay a decent bit of karma for training Arcana since I don't allow Edge on Initiation tests.
So yeah, definitely at the point where 20 karma for a way would actually have been worth it for him, to get more punch out of his PP.