After Sectionals the IHSAA gets the gate revenue after paying officials, a modest host site fee, modest travel stipend, and the revenue from the first 200 tickets being split between the 2 participating schools. A home team/town crowd plus 1 loyal traveling fan group is going to produce more gate revenue than 2 loyal traveling fan groups, plus site host expenses and travel stipends would likely increase.
As a loyal traveling fan, the atmosphere is what I would miss most. As bad a drive as it is, I'd rather play East Central in St. Leon than in Sellersburg.