Say I have a monthly allowance of 100 sMerits per month. If I only spend 70 within the month (30 days on a given window timeframe really), I’ve conceptually not poured into the Merit System 30 sMerits. It’s really more complicated than that, and the key is that a Merit Source can never have more sMerits than his maximum allowance in a given moment in time. Taken to the extreme, if my allowance is of 100 sMerits, and I don’t spend any, my sMerit counter will stabilize at 100 sMerits (not increasing any further until y spend some and it gets refilled again).
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Yes, I am a merit source, and I was only discussing smerit refreshment for sources. Regular smerits have different rules, and fewer restricyions on their awarding.
My understanding is that your bucket doesn't have a time frame for refilling, but each replacement smerit has its own shelf life of 30 days. If is not spent during that period, then it decays, and cannot be spent or replaced. This means that less active merit sources may have a decreasing pool of source smerits to spend. If that pool drops to zero, then the person is removed as a merit source. Periodically source smerits are reviewed according to a published formula. In this calculation source smerits and earned smerits that have been spent are aggregated, and a new limit is allocated. It is slightly higher than the rate of merit awarding for the relevant period. This means that the supply of smerits available for an active source will increase gradually. Thus a profligate spender supporting spammers will be able to provide more support. This will come from his increased allowance, and fromn any reciprocal "earned" smerits.