My hunch (and it's just a hunch) is that the Hertz points program put customers into two categories: people who didn't care much (weren't earning a huge number of points, or didn't do a lot of personal rentals), and hence wouldn't be affected one way or the other, and people who cared a lot (people who used the points for high dollar redemptions), who were costing a fortune. I routinely got 15c/point or more (occasionally >30c) in value booking Premium cars for weekend rentals in NYC. I'm not hugely surprised that Hertz would look at that and say that they weren't really intending on giving me >1/3 back on my rentals.