Deer population estimates for Ohio have fluctuated from between 650K to 700K over the last several years. I think that deer/vehicle accidents increased to an alltime high for the state after 2006. I would think that since the deer population has been at historical highs, or close to them, this past entire decade, it shouldnt be surprising that harvest rates are high on public and private land alike during the same period.
I think that Ohio has something like a combined total of 30 million acres of agricultural and forested ground. So, even if all 250 outfitters in Ohio controlled 10,000 acres apiece, it would still result in just a fraction of potential hunting ground being monopolized by outfitters.