I think he's talking about the rule where if you worship a landscape deity/guardian/etc., you gain powers, but the deity loses strength--the more people who (e.g.) gain feats from Two-Top Hill, the lower Two-Top Hill's power as a guardian will be.
So if X people are in the cult of Kero Fin (and getting magic powers), Kero Fin's inherent powers (like "Resist Climber" or whatever) will decrease, because the power has been farmed out to worshippers.
...but I don't have the rule book with me...
--AMS
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