Dao invests some funds into an LP or other revenue generating fund.
Then distributes earnings to staked accounts.
Possibly, by buying SPS from market and then distributing. Maybe, distributing the earned Token itself. Although, distributing SPS as the final product keeps it straight forward.
Either way, I like the idea of profit distribution (from whatever means) over plundering our Capital.
Vouchers are a good reward too but I'd see them more as a snack & would want to avoid Vouchers becoming a problem as we encountered with DEC.
Distributing earned rewards seems long term sustainable.