Not to belabor the point but just for fun I checked the ACC tournament champions list. The 4 non-tobacco road schools won the ACC tournament 3 times in the conference’s first 30 years: Maryland in ‘58, South Carolina in ‘71, Virginia in ‘76. (Clemson in Never)
Yes, I find this interesting as well. There have only been 12 non-Tobacco Road ACC tournament champions in the 66 year history of the conference (18%) with four of those coming during an unprecedented stretch of four straight between 2012 and 2015. That streak marked only the second streak of consecutive non-Tobacco Road champions, with the first coming from Maryland and Georgia Tech in 1984 and 1985 respectively.
Of the original non-Tobacco Road members of the ACC (USC, Clemson, Virginia and Maryland), there are a combined six championships (Maryland 3, Virginia 2, USC 1), leaving Clemson as the only original ACC member to have never won an ACC tournament championship. Of course, USC left the ACC in '71, and Maryland left in 2014.
Also interesting, the ACC Tournament has only been held outside of North Carolina 13 times in 66 years. Of those 13 tournaments, a non-Tobacco Road team has won 3 times (23%), including Georgia Tech in 1985, when the tournament was held at The Omni in Atlanta. Maryland narrowly lost 61-60 when the tournament was held in Landover, MD in 1981. One could reasonably draw the conclusion from this that had the tournament been held more often outside of NC, there very well could have been many more non Tobacco Road champions. Imagine if the tournament had been held in Columbia in 1969 or 1970?
All this to illustrate the point of a March, 1971 editorial I ran across from The State which posited that the ACC was formed by the four members from North Carolina, for the benefit of those four members. They needed USC, Clemson, Maryland and Virginia to round out a viable conference in 1953. But the outsiders were supposed to be step-children, to be seen but not heard.
I still think it was a mistake for USC to leave the ACC in 1971, but its always instructive to understand the stifling power structure in place during USC's days as a member.