Have you considered an exponential decay schedule for your zaps? You'll never run out that way, but it'll get you very close to spending down your entire wallet everyday.
I think that's what already is happening naturally. The closer I get to 0, the more I make sure that I only zap very good content. And only exactly how much I think it's really worth it.
I already did this yesterday but I didn't make it official with an announcement.
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