I HAS EIDEYA
Tom, you were saying something along the lines of considering making it a regular thing. Im guessing that would of course be as a means of incentive. To that end I don't think just having ppl deposit points justifies it. However if every week you tabulate a list of the users who made the most reviews deemed to be useful and draw from how ever many of them you would be encouraging not only more reviewing but more constructive reviewing.
Of course this would mean a bit of script wizadry but I am sure it is not beyond your scope.