The numbers are probably accurate.
GwtW ran as a road show presentation from December 1939 to July 1940, with premium advanced-ticket seating selling for "upwards of $1 per ticket", after which it then reduced ticket prices in half for the remainder of the road show presentation period until its general release with "normal" ticket prices in 1941. In 1942, MGM bought the outstanding shares of the production and became the full owner, and promptly re-released it. 1947 saw another re-release, and again in 1954--this time cropped to widescreen. It was re-released in 1961, 1967, 1971, 1989 (with audio and video restoration for the 50th anniversary), and 1998. There have been a few more special event screenings since then, but no more wide releases.
Exclusive road show presentations in major cities used to be fairly common for big-budget productions, and would usually have advance-ticket, reserved seat sales at a much higher ticket price than general admission theaters. Most road show releases had a limited number of showings per day (usually one or two). Many films getting the road show treatment were 3 hours or more, and almost always had a 15-minute intermission between the first and second acts. Much like a Broadway play, there were frequently souvenir programs available in the lobby. A typical road show engagement lasted anywhere from a few months to a year or more, before the film moved to a general admission theater. The films were frequently cut down to a shorter running time when moving to a general admission theater to allow more showings per day.
As an example, here's an article for the Richard Burton/Elizabeth Taylor version of Cleopatra, which ran in a road show format for 72 weeks in LA and 64 weeks in New York. https://www.thedigitalbits.com/columns/history-legacy--showmanship/cleopatra-roadshow-engagements