All fully funded DI programs have a maximum of 9.9 scholarships for wrestling. In most cases they get 9.9 scholarships whether they're in or out of state.
The real budget comes from other sources. Wrestlers work at camps and get paid whatever the coach wants/can give them or they have work study jobs (mopping mats, etc.) At a place like OSU, there's a lot of money provided by their booster club which pays for all those Olympians and other grad assts who stick around. Plus off-season travel dollars for their "club" team. I bet OSU's booster club donates as much or more money each year to wrestling than the school budget for wrestling is.