obviously you can be the only one to put a value on the land, but here are some things to consider.
if price goes up, say to $250 a gun per day, i can almost assure you pay to hunt, hunter numbers will dwindle quickly. with food and gas prices headed higher next year, a lot of guys will fold their tents...stay home and pay to shoot preserve birds.....no one likes it, but going one time for 3-4 days in SD, will soon equal a 4-6 bird day on most any preserve and will allow about 3-4 hunts per year.....rather than the long drive, gas bill, motel rooms and license...to come to SD....one time......
i would put the ground into production, $8-9 corn is gonna be huge next season, another dry year in some spots could boost it even more.....better than hoping for guys to keep coming and paying bigger money all the time.
it's just like anything, when it comes to pay to hunt, there is a limit where the value is questionable for the time, wear and tear on vehicle and money are concerned.....i don't see this getting any better.....ask your guys this season....would you pay $225-250 per day next year, if you had to?......