Free: Contests & Raffles.
I will agree that getting on private ground is worse. When I started hunting over there (rifle), ranchers begged you to take everything your truck could hold. Now they want paid.
Anybody who has hunted Montana since the late 1980's can tell you land (private/BLM/State) tied up by outfitters increased dramatically after the guaranteed tag program went into effect.
It might have something to do with the access of land. I would bet that 95% of land that whitetails hang out in is privately owned, so unless the hunter had an "in" he wouldn't find much opportunity.