Until we won the 1971 ACC Basketball tournament, Maryland's 1958 squad was the only non-big-4 team to have done so. The "some reason" is that College Park did invest in hoops during the 1950s, but backed off a bit to strengthen academics on campus in the early 1960s.
UVA, USC, and Clemron invested very little in their hoops programs until the mid 1960s.
Press Maravich (Pistol Pete's dad) had taken the Taters to the 1962 tournament finals; they lost to Wake.
Everett Case can calling for Press to be his assistant shortly thereafter. And Case offered more $$$ as his assistant than AD Frank Howard was paying him. Howard made no effort to keep him. Self-imposed basketball chump school.
Fans around the league went beserk all the time at all games. USC was not singled out.
The Big Four had no problem with Maryland's competitiveness. They had no problem with USC's either. The problem was with Frank McGuire. He was considered a "troublemaker" in league circles, and resigned from UnCarolina under pressure.
Think about it. A coach who wins you a national title you force to resign? I've stated before - we were in the crossfire between McGuire and the ACC.
And keep in mind that it was Dietzel, not McGuire, who pushed for ACC secession. Wish instead we had sent "Pepsodent Paul" back to West Point or Baton Rouge.