Some people believe, if a politician has $X to spend, they're more likely to spend it on things demographics with high turnout rates want than things demographics with low turnout rates want.
So for example, these people see the interests of people of retirement age represented much better than the interests of under-30s. They see this as part of the cause of rising college costs, and rising house prices transferring wealth from the young to the old.
By this model, every non-voter that starts voting is a step towards more even -and hence more just- representation. And if you're in a demographic with a below-average voting rate, the state better serving your needs.
Of course, that's a largely academic argument in the election of the board of supervisors for a conservation district, who probably don't have much influence on matters like house prices.