Have you looked into what Roberts involvement actually was and length spent as the top litigator in the firm vs his other pro bono cases?
Roberts didn't bring this to the Surpreme Court, Scalia's dissent was on the merits of the Constitutionality not on Roberts giving 10 hours as opposed to a 100 on another case.
You want to nitpick on how many hours he spent on the case?
It doesn't matter. It was voluntary work. He didn't have to do it, but he did.
Some of us would like to know why. And we'd like to know if he agrees with the SCOTUS's ruling, especially since he helped bring it about.