Votes expire after four years, capping any donor at roughly sixteen active votes.
The platform exists to make collective decision-making consequential. It fails if one person's voice dominates. The concern is not about donors who have lost interest — it is about the opposite. A donor who has been engaged since the organization's founding and has given faithfully in every cycle should not, twenty years in, hold a voice many times larger than a newer donor giving at the same rate today. Sustained commitment is real and worth acknowledging, but it is not a bigger claim on the organization's direction.
The mechanism is vote expiration. Each vote expires four years after the donation that earned it. A donor who gives in every cycle is always carrying forward four years of recent votes — no more, no less. Someone who has given for twenty years has the same vote count as someone who has given for four, provided both have participated in every cycle during the trailing window.
The natural cap works out to roughly sixteen active votes — reached by a donor who has given in every cycle for four years running. Below that, a donor has however many votes match their recent participation. No one carries more than sixteen.