It's a value call.
One of the things we didn't want to have happen is people stopping buying skills or attributes and focusing entirely on Perks.
So 5 or 6 spells/miracles/powers seems about right, but we didn't want to say "You can't take anymore ever."
And if you really do want more spells, there'll be those other Perks in the cosm books that will allow you to select more.
As for Beta Clearance and beyond, we'll be addressing that but don't have anything to announce right now.
And while I don't personally want to, or plan, to be all about Perks, Perks are definitely going to be a big thing for most any character that is running around in my head right now. And while slightly off the topic of the thread, it's still kind of related, is that anything you decide for your character as being part of their "build" in regard to Perks is likely to force you down one path, and make it trickier to dabble. I assume this was also intentional, getting characters to basically pick a specialization? Or maybe it's that exact kind of tradeoff, where you are either very specialized, or you are very dabbler-y, and jack-of-all, master-of-none, kind of deal. But definitely see Perks getting cost-prohibitive very quickly, in general, regardless of the path taken. (Note: this is not a negative critique, but observations being discussed.)
I mean, continuing my example, if I go down my spellcaster route, and get 5 spells, Resilient, Elf Sorcerer, and Magister, I've burned ... I think I'm at 32 XP. Spellcaster, Spellcaster (both free), Spellcaster (5), Resilient (7), Elf Sorcerer (9), Magister (11). If I spend other XP on Attributes or Skills, that stops my Perks from getting more expensive until the Cosm book comes out, where I can start spending more to get more than one spell at a time from specialized lists. But this means that, as a Mage, I likely can't or simply won't spend on other Perks (like Light) that might interest me. Basically because I need to keep my future Perk costs down as well.
As higher Clearance levels have not been released, and have some time before they are, is there any chance that we can track our Perks on a per-tier basis? Something like a cost-reset when we hit new tiers for Perk-buying. Not necessarily full reset, and maybe even regardless of existing Perks held.
Alpha: Perks start at 5, increasing by 2 for each additional.
Beta: Perks start at 7 or 9, increasing by 2 for each additional.
Gamma (assuming Greek, rather than phonetic): 9/11/13 depending on previous start/jump rates, increasing per others or maybe even by 3 each.
Obviously, I don't know how this would scale, but there will come a point when a character is going to stop spending on Skills, and move to Perks and Attributes exclusively. And it won't take long before you're looking at Perks being 20+ (think it's around 9th @117 total xp on Perks).
Just some thoughts. I would hope characters are running out of Skills to upgrade by Gamma/Charlie, even if they have gone with 3-4 purchased Perks. But I definitely haven't done all the maths.