I don't disagree that there are variations in accounting practices. And I don't disagree that it isn't very complicated to figure out how to make the subsidy look smaller without looking like you are gaming the system. And if it made a significant difference, then Rutgers would just do it and eliminate all the heat they get for the subsidy.
So yeah, you can find 2 dozen examples like turf grass upkeep or concession services, each worth a hundred thousand or so. But added all together, they still don't make a noticeable dent in the subsidy.
The biggest area that Rutgers could possibly hide money is in Direct Facilities Expenses, where Rutgers currently reports almost $11MM in expense. The other P5 schools with subsidies above $10MM report facilities expenses as follows: Maryland $11.5MM, Virginia $15MM, Oregon St $11 MM, and Arizona St $6 MM. So even if Rutgers follows whatever accounting tricks ASU follows, and cuts another $5MM out of facility expenses (on top of the $3 MM you save from items like turf grass), you've now reduced the subsidy from $36MM to $28MM, more than $10MM more than the next highest P5 program, and more than $18MM more than all but 4 other P5 programs.
BFD. And that is assuming that the $11MM that Rutgers reports doesn't contain any accounting tricks to make it look lower. Comparing to other B1G programs that don't have to rely on accounting tricks, it looks like Rutgers already takes advantage of accounting tricks to reduce the reported expenses for facilities. Only 2 schools report facility costs lower than Rutgers, and the average for the conference is more the $7MM more than reported by Rutgers.