As someone who has been to ND games at Stanford, AF Academy, BC and Purdue, I can tell you

the phenomenon is not limited to ND. The Irish “travel well” too. A few times I swore there were more ND fans at Stanford games then Stanford fans.

Setting up these must buy multi-game packages can almost backfire. In your scenario, tOSU fans will buy the packages and dump the non-tOSU games on the secondary market or just leave the seats empty.