Cut of date for Goodguys?

[N2TRUX]

Since this forum seems to be active with Goodguys staffers, maybe I can get a response here. Why does Goodguys insist on maintaining the 1972 cut off date? The event started out with a 1948 date, then progressed to 1964 to accommodate popularity of the later big body cars. Once again the date was rolled forward to 1972 to include the increase in attention to the trucks and cars of that era.

With the expansion of the show series, why don't they consider a rolling date cut off like NSRA has gone to? There is a large void in shows for post 72 cars and trucks that needs to be filled. I have tried to get an answer from the staff at the Goodguys events, and no one wanted to discuss it. Maybe I can get one here.